fix(ci): branch-tip check fails on private repos, freezing :latest - #51
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Anonymous git ls-remote returns nothing for private repos from GitHub-hosted runners, silently forcing is_tip=false and freezing the :latest tag. Query the GitHub API with the job token instead. Observed: doctopus prod frozen on 2026-09-08 image for 7 days while CI stayed green (sha tags published, latest never moved).
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Summary
git ls-remotewithout credentials returns nothing for private repos on GitHub-hosted runners →tip=""≠ SHA →is_tip=false→:latestnever movesgh api repos/{repo}/branches/{branch} --jq .commit.shaauthenticated viaGH_TOKEN: github.token:latest(doctopus prod via Dokploy) silently froze on old images while CI stayed greenEvidence (doctopus, run 35033256421)
Empty
tip— ls-remote returned zero refs for the private repo.Test plan
is_tip=trueand-t ...:latestlatestindex digest changes and both arch legs present