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Use the Publish to BCR reusable GitHub workflow
Updates `.github/workflows/release.yml` and adds `publish-to-bcr.yml` for publishing to the Bazel Central Registry. Part of bazel-contrib#1482 (originally broken out from bazel-contrib#1722). `release.yml` now uses the `release_ruleset` workflow from `bazel-contrib/.github`, which does everything `release.yml` did previously and adds SLSA provenance attestations. `release.yml` then invokes the new `publish-to-bcr.yml` workflow after publishing a successful release to GitHub. Requires that the `BCR_PUBLISH_TOKEN` GitHub secret and the `registry_fork` specified in `.github/workflows/publish-to-bcr.yml` are in place. See `.bcr/README.md` for all the details and references. --- This will enable automated publishing to https://registry.bazel.build/.
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‎.bcr/README.md‎

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# Bazel Central Registry publication
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The [Publish to BCR GitHub app](https://github.com/bazel-contrib/publish-to-bcr)
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uses these configuration files for publishing Bazel modules to the [Bazel
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Central Registry (BCR)](https://registry.bazel.build/).
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[.github/workflows/publish-to-bcr.yml](../.github/workflows/publish-to-bcr.yml)
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uses these files to configure the [Publish to BCR](
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https://github.com/bazel-contrib/publish-to-bcr) workflow for publishing to the
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[Bazel Central Registry (BCR)](https://registry.bazel.build/).
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- [Publish to BCR workflow setup](
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https://github.com/bazel-contrib/publish-to-bcr/tree/main/README.md#setup)
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https://github.com/bazel-contrib/publish-to-bcr?tab=readme-ov-file#setup)
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- [.bcr/ templates](
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https://github.com/bazel-contrib/publish-to-bcr/tree/main/templates)
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- [.github/workflows/publish.yaml reusable workflow](
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https://github.com/bazel-contrib/publish-to-bcr/blob/main/.github/workflows/publish.yaml)
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Related documentation:
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Notice that the setup instructions suggest saving the Personal Access Token as
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`PUBLISH_TOKEN`. We save it as `BCR_PUBLISH_TOKEN` instead, as inspired by
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aspect-build/rules_lint#529, to make this value more self documenting.
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## Provenance attestations
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This workflow also produces attestations required by the [Supply chain Levels
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for Software Artifacts (SLSA)](https://slsa.dev/) framework for secure supply
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chain provenance.
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Examples:
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<!-- Replace these with rules_scala examples once they're available. -->
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- [aspect-build/rules_lint v1.3.4 release and publish run with attestations](
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https://github.com/aspect-build/rules_lint/actions/runs/14410869652/attempts/1)
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- [aspect-build/rules_lint v1.3.4 attestations](
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https://github.com/aspect-build/rules_lint/attestations/6280291)
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- [aspect-build/rules_lint attestations](
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https://github.com/aspect-build/rules_lint/attestations)
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## Related documentation
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- [bazelbuild/bazel-central-registry](
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https://github.com/bazelbuild/bazel-central-registry)
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- [SLSA: Provenance](https://slsa.dev/spec/v1.0/provenance)
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- [in-toto](https://in-toto.io/)
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- [GitHub Actions](https://docs.github.com/actions)
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- [Security for GitHub Actions](
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https://docs.github.com/en/actions/security-for-github-actions)
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- [Using secrets in a workflow](
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https://docs.github.com/en/actions/security-for-github-actions/security-guides/using-secrets-in-github-actions#using-secrets-in-a-workflow)
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- [Using artifact attestations](
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https://docs.github.com/en/actions/security-for-github-actions/using-artifact-attestations)
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- [Writing Workflows](
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https://docs.github.com/en/actions/writing-workflows)
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- [Accessing contextual information about workflow runs: 'secrets' context](
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https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/accessing-contextual-information-about-workflow-runs#secrets-context)
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- [Workflow syntax for GitHub Action: 'on.workflow_call.secrets'](
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https://docs.github.com/en/actions/writing-workflows/workflow-syntax-for-github-actions#onworkflow_callsecrets)
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- [Sharing automations](https://docs.github.com/en/actions/sharing-automations)
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- [Passing inputs and secrets to a reusable workflow](
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https://docs.github.com/en/actions/sharing-automations/reusing-workflows#passing-inputs-and-secrets-to-a-reusable-workflow)
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- [actions/attest-build-provenance](
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https://github.com/actions/attest-build-provenance)
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- [in-toto/attestation](https://github.com/in-toto/attestation)
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- [slsa-framework/slsa-verifier](
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https://github.com/slsa-framework/slsa-verifier)
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## Inspiration
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Originally based on the examples from aspect-build/rules_lint#498 and
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aspect-build/rules_lint#501. See also:
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- bazelbuild/bazel-central-registry#4060
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- bazelbuild/bazel-central-registry#4146
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- slsa-framework/slsa-verifier#840

‎.github/workflows/publish-to-bcr.yml‎

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# Publishes to the Bazel Central Registry.
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#
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# Based on .github/workflows/publish.yaml from aspect-build/rules_lint v1.3.5.
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# See .bcr/README.md.
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name: Publish to the Bazel Central Registry
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on:
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# Run from release.yml.
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workflow_call:
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inputs:
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tag_name:
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required: true
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type: string
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secrets:
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bcr_publish_token:
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required: true
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# In case of problems, enable manual dispatch from the GitHub UI.
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workflow_dispatch:
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inputs:
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tag_name:
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required: true
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type: string
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jobs:
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publish-to-bcr:
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uses: bazel-contrib/publish-to-bcr/.github/workflows/[email protected]
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with:
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tag_name: ${{ inputs.tag_name }}
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# bazelbuild/bazel-central-registry fork used to open a pull request.
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registry_fork: simuons/bazel-central-registry
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permissions:
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attestations: write
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contents: write
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id-token: write
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secrets:
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# Necessary to push to the BCR fork and open a pull request.
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publish_token: ${{ secrets.bcr_publish_token }}

‎.github/workflows/release.yml‎

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tags:
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- 'v*.*.*'
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jobs:
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build:
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runs-on: ubuntu-latest
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steps:
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- name: Checkout
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uses: actions/checkout@v3
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# In case of problems, enable manual dispatch from the GitHub UI.
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workflow_dispatch:
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inputs:
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tag_name:
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required: true
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type: string
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# Uses the `release_ruleset` workflow to generate provenance attestation files
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# referenced by the `publish-to-bcr` workflow.
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#
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# Based on .github/workflows/release.yml from aspect-build/rules_lint v1.3.5.
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# See .bcr/README.md.
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- name: Prepare workspace snippet
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run: .github/workflows/workspace_snippet.sh ${{ env.GITHUB_REF_NAME }} > release_notes.txt
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permissions:
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attestations: write # Needed to attest provenance
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contents: write # Needed to create release
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id-token: write # Needed to attest provenance
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jobs:
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release:
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uses: bazel-contrib/.github/.github/workflows/[email protected]
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with:
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bazel_test_command: "bazel test //src/... //test/... //third_party/..."
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prerelease: false
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release_files: rules_scala-*.tar.gz
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release_prep_command: .github/workflows/workspace_snippet.sh
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tag_name: ${{ inputs.tag_name || github.ref_name }}
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- name: Release
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uses: softprops/action-gh-release@v1
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with:
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# Use GH feature to populate the changelog automatically
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generate_release_notes: true
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body_path: release_notes.txt
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fail_on_unmatched_files: true
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files: rules_scala-*.tar.gz
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publish-to-bcr:
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needs: release
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uses: ./.github/workflows/publish-to-bcr.yml
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with:
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tag_name: ${{ inputs.tag_name || github.ref_name }}
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secrets:
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bcr_publish_token: ${{ secrets.bcr_publish_token }}

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