Do public and private package URIs in Container Registry all begin with ghcr.io?

[khalkie]

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Hi there,
I just wanted to confirm if all Container Registry package URIs begin with ghcr.io?

I assume that public ones do, is this also true for private packages?

I'm asking because I saw in the attest-build-provenance docs that there is a way to push to the registry at the same time as provenance is generated. (https://github.com/actions/attest-build-provenance?tab=readme-ov-file#container-image)

The URI in this case would be taken from subject-name, which the docs states should be "the fully-qualified image name (e.g. "ghcr.io/user/app" or "acme.azurecr.io/user/app""

However these examples seem to indicate that a different prefix is possible? (i.e. acme.azurecr.io) Is this just a really dumb question and the ghcr.io prefix is stored in GitHub Container Registry, and the other prefix will be stored in another registry (i.e. Azure Container Registry)?

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