The workflow was generating invalid Docker tags with format ':-3b251d7'
due to empty branch names in PR contexts.
Problem:
- Tag config: type=sha,prefix={{branch}}-,format=short
- For PRs: {{branch}} is empty → results in ':-3b251d7' (invalid)
- Docker doesn't allow tags starting with hyphen
Solution:
- Changed to: type=sha,format=short
- Now generates: '3b251d7' (valid) without branch prefix
- Works correctly for PRs, branches, and tags
Valid tag examples now:
- PRs: pr-44, 3b251d7
- Branches: main, 3b251d7
- Tags: v1.0.0, 1.0, 1, 3b251d7
Claude
ae93755dbb