The github.token (automatic workflow token) in Gitea Actions
doesn't inherit packages:write permission for container registry.
Use the GITEA_TOKEN secret instead with direct docker login.
Ref: CAR-973, CAR-1009
docker/login-action@v3 fails with Gitea's automatic token.
Use direct docker login with github.token instead, which has
the necessary write:package scope for the container registry.
Related: CAR-1009 (CI registry token standardization)
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