ci: Update loki-release workflows to build Docker images "natively" #15907
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
What this PR does / why we need it:
Build Docker images "natively" on runner architecture
This PR changes the way how multi-arch images are built. Instead of cross-compiling on emulated architecture using multiple platforms in the docker buildx build command, it uses dedicated arm and amd runners to build images "natively" and later combining the resulting image digests into a multi-arch manifest.
Special notes for your reviewer:
This PR is equal to #15858 but the loki-release lib is vendored from upstream.
Upstream changes: grafana/loki-release#180