Summary
Re-run of the 3.2.8 release: PR #1047 merged but the docker release build failed three times with error writing layer blob: failed to reserve cache (GHA cache write aborting the buildx multi-arch build in docker/build-push-action@v4).
This PR carries the CI fix — docker actions bumped to current majors (build-push-action@v6, setup-buildx@v3, metadata@v5, login@v3, qemu@v3) and ignore-error=true on cache-to so a cache write failure can never fail a release again.
Merging this publishes the 3.2.8 images and GitHub release (version from PR title). Release content is unchanged from #1047.
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