ci: add Docker buildx GHA layer cache to build workflows#289
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Caches Docker build layers in GitHub Actions cache (type=gha) scoped per platform. The second build-push-action call in the update workflow (push step) now reuses layers warmed by the test-image step, making the push build effectively free for this scratch-based image and future-proofing for any Dockerfile growth.
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Adds
cache-from: type=gha/cache-to: type=gha,mode=max(scoped per platform) to alldocker/build-push-actioncalls in both build workflows.In
update-current-image.yml, the push step now reuses layers warmed by the preceding test-image step. For the currentFROM scratchDockerfile this saves minimal time, but it correctly establishes the caching pattern for future Dockerfile changes.Note: this PR is stacked on top of #288 (
ci/multi-arch-manifest). Merge that one first, then rebase this branch ontomainbefore merging.