[29.x backport] gha: Add release branch sync workflow#7097
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Add a manually dispatched workflow for maintainers to sync a Docker release branch to a selected release tag. The sync-release-branch job checks out the release branch, computes the list of unmerged tags up to the requested tag via scripts/unmerged-tags, merges them in order via scripts/sync-branch using git merge --no-ff (resolving conflicts by taking the tag's content), then pushes the result to a temporary branch. The push-release-branch job runs after manual approval via the docker-releases environment. It verifies that neither the release branch nor the temporary branch moved since the sync job ran before force-advancing the release branch and deleting the temporary branch. Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com> (cherry picked from commit 182f56f) Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
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backport: gha: Add release branch sync workflow #7091
port: gha: Add release branch sync workflow moby/moby#52966
Add a manually dispatched workflow for maintainers to sync a docker release branch to a selected docker release tag.
The job checks out the requested release branch, merges the tag with
git merge --no-ff, checks the worktree content out from that tag, stages the result, and pushes the updated branch.The actual push is guarded by the
docker-releasesGitHub environment which requires a manual approval.