Describe the problem
Right now, we're misusing Docker caching between CI build steps to share the built image. This is fragile as can easily lead to building a different image in each job without noticing.
Instead, the build step should produce the images which would be tested, merged and published, where additional steps would not invoke build.
Describe the solution you would like
There is documentation to follow on this topic: https://docs.docker.com/build/ci/github-actions/multi-platform/#distribute-build-across-multiple-runners
https://docs.docker.com/build/ci/github-actions/share-image-jobs/ might also be useful, but that probably won't work with multi arch images (but might work for testing amd64 images)
Describe alternatives you have considered
No response
Screenshots
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Additional context
No response
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