ci: add Docker layer caching via BuildKit GHA cache backend - #245
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Replace plain docker build with docker/build-push-action using cache-from/cache-to with type=gha. This caches Docker layers in GitHub Actions cache storage, cutting rebuild times from ~14-18min to near-zero on cache hits. Fixes #241
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Replaces the plain
docker buildstep withdocker/build-push-action@v6using the BuildKit GHA cache backend (cache-from: type=gha/cache-to: type=gha,mode=max).This caches Docker build layers in GitHub Actions cache storage, so subsequent CI runs skip already-built layers. Combined with the cargo-chef setup in the Containerfile, dependency compilation layers should be cached across runs — cutting the ~14-18min Docker build down to near-zero on cache hits.
Changes:
docker/setup-buildx-action@v3stepdocker buildshell step withdocker/build-push-action@v6with GHA cacheload: truemakes the image available locally for any downstream stepsFixes #241