ci: guard release commit push against concurrent merges

[mishushakov]

The release "Commit new versions" step pushed without a rebase, so a PR merging mid-release failed the push and the whole release. A plain git pull --rebase would fix that but could rebase the version bump onto concurrently-merged package code that was never in the published artifacts — a silent source↔artifact divergence.

This guards the rebase: on a non-fast-forward push, it only rebases when the incoming changes don't touch packages/; if they do, it fails loudly for manual reconciliation.

🤖 Generated with Claude Code

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Latest commit: 57d17ff

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[cursor]

PR Summary

Low Risk
CI-only change to release git push behavior; no runtime or package code affected.

Overview
Mid-release merges caused the version-bump push to fail because it was not a fast-forward. The Commit new versions step in publish_packages.yml now tries git push first, and on failure fetches the branch and checks whether commits that landed during the release touched packages/. If they did, the job errors instead of rebasing the version bump onto package code that was never published. If they did not, it rebases and pushes again.

^{Reviewed by Cursor Bugbot for commit 57d17ff. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

Package Artifacts

Built from af3906e. Download artifacts from this workflow run.

JS SDK (e2b@2.30.4-mishushakov-fix-release-commit-push-race.0):

npm install ./e2b-2.30.4-mishushakov-fix-release-commit-push-race.0.tgz

CLI (@e2b/cli@2.12.2-mishushakov-fix-release-commit-push-race.0):

npm install ./e2b-cli-2.12.2-mishushakov-fix-release-commit-push-race.0.tgz

Python SDK (e2b==2.29.3+mishushakov-fix-release-commit-push-race):

pip install ./e2b-2.29.3+mishushakov.fix.release.commit.push.race-py3-none-any.whl

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