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
The publish-manifest job was failing because it tried to create manifests
from non-existent architecture-specific tags (latest-amd64, latest-arm64).
docker/build-push-action@v5 already creates multi-arch manifests automatically
when building for multiple platforms, making this job redundant.
The workflow now correctly builds and pushes multi-arch images in a single
step with proper manifest lists included.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
Claude
paul