Updated the image detection step in the `.gitea/workflows/build-images.yml` workflow to better handle manual inputs and automatic change detection.
Changes:
- Reorganized the logic to handle manual inputs first; if a manual input is present, it validates the image, sets the output matrix immediately, and exits, bypassing git diff checks.
- Added explicit error handling and output setting for invalid or empty manual inputs to prevent workflow failure confusion.
- Grouped the Git diff detection logic into a distinct block that runs only if no manual input is provided.
- Added a debug echo statement to the build job to verify the current matrix image being built.
3458b1c8a0