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Gitea 1.27 fails with HTTP 500 when pushing a tag that already exists. Add delete_remote_manifest() to delete the existing manifest via the Docker registry v2 API before each push. Implements: REQ-1, REQ-2, REQ-3, REQ-4, REQ-5 Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>