Rewrite Docker aspects of CI#1192
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shepmaster merged 1 commit intomainfrom Feb 16, 2026
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A recent [GHA change][] updated to Docker 29, which causes build failures when we download / retag / push the image: ``` image with reference ghcr.io/integer32llc/rust-playground-ci-rust-beta:latest was found but does not provide the specified platform (linux/amd64) ``` I don't actually know what the deal is here, but I see that Docker 29 made changes to default container formats and started pushing multiple aspects of the image, including some attestation metadata as the platform `unknown/unknown`. My suspicion is that GHCR does not support this fully, so when we pull and push, something is lost and it's trying to push the attestation metadata which fails. To work around this, we can change the build process so that we always use `docker/build-push-action`, which does *something* different and works. We rely on the build caching so that "rebuilding" in multiple jobs is still fast. [GHA change]: actions/runner-images#13474
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A recent GHA change updated to Docker 29, which causes build failures when we download / retag / push the image:
I don't actually know what the deal is here, but I see that Docker 29 made changes to default container formats and started pushing multiple aspects of the image, including some attestation metadata as the platform
unknown/unknown.My suspicion is that GHCR does not support this fully, so when we pull and push, something is lost and it's trying to push the attestation metadata which fails.
To work around this, we can change the build process so that we always use
docker/build-push-action, which does something different and works. We rely on the build caching so that "rebuilding" in multiple jobs is still fast.