Build riscv64 on alpine stable with lld 18 from edge (#17)

Author: ntkme

.github/workflows/build.yml

@@ -89,7 +89,7 @@ jobs:
     runs-on: ubuntu-latest
 
     container:
-      image: docker.io/library/alpine:${{ matrix.target-arch == 'riscv64' && 'edge' || 'latest' }}
+      image: docker.io/library/alpine
 
     strategy:
       fail-fast: false
@@ -131,6 +131,12 @@ jobs:
         run: |
           apk add --no-cache -- bash clang curl git gn lld llvm python3
 
+      # TODO: remove once lld 18 is available in alpine stable
+      - name: Install build tools
+        if: matrix.target-arch == 'riscv64'
+        run: |
+          apk upgrade --no-cache --repository=https://dl-cdn.alpinelinux.org/alpine/edge/main -- lld 
+
       - name: Setup multiarch
         run: |
           cd "$(mktemp -d)"
@@ -148,13 +154,7 @@ jobs:
       - name: Install default sysroots
         run: |
           cd dart-sdk/sdk
-          ./build/linux/alpine_sysroot_scripts/install-sysroot.sh
-
-      - name: Install riscv64 sysroot
-        if: matrix.target-arch == 'riscv64'
-        run: |
-          cd dart-sdk/sdk
-          ./build/linux/alpine_sysroot_scripts/install-sysroot.sh riscv64
+          ./build/linux/alpine_sysroot_scripts/install-sysroot.sh x86_64 x86 aarch64 armv7 riscv64
 
       - name: Build
         run: |

.github/workflows/release.yml

@@ -102,7 +102,7 @@ jobs:
           build-args: |
             BASEURL=${{ github.server_url }}/${{ github.repository }}/releases/download/${{ github.ref_name }}
           context: .
-          platforms: linux/amd64,linux/386,linux/arm64,linux/arm/v7
+          platforms: linux/amd64,linux/386,linux/arm64,linux/arm/v7,linux/riscv64
           push: ${{ !endsWith(github.ref_name, '.beta') && !endsWith(github.ref_name, '.dev') }}
           tags: ${{ steps.docker-metadata.outputs.tags }}
           labels: ${{ steps.docker-metadata.outputs.labels }}