Cache Docker build layers with type=gha#86
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The docker.yml build had no build cache, so every run rebuilt the image from scratch. Add buildx type=gha cache scoped per platform so layers are reused across runs.
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The
docker.ymlbuild used no build cache, so every run rebuilt both images from scratch. Add buildxtype=ghacache scoped per platform.The GHCR build (required) populates the cache (
cache-to,mode=max); the optional DockerHub build reuses those layers viacache-from, so it becomes a cache hit rather than a second full rebuild — while keeping itscontinue-on-errorbest-effort semantics.cache-tocarriesignore-error=trueso a GitHub cache-service hiccup during cache export can't fail the required publish (cache is only an optimisation).