Submit Checklist (REMOVE THIS SECTION BEFORE SUBMITTING)

• I have selected the next branch as the destination for my PR, not main.
• I have listed all changes in the Changes section.
• I have filled out the Issues section with the issue/discussion link(s) (if applicable).
• I have tested my changes.

Changes

• SHA256 hash support for Docker image deployments
• Enhanced DockerImageParser to detect and handle image hashes
• Updated UI forms with better guidance for hash input
• Modified deployment logic to use @sha256: format for Docker pulls
• Comprehensive test coverage for all hash scenarios

Issues

• fix #6435

/claim #6435