fix: improve Docker Hub description update reliability

- Add continue-on-error to prevent workflow failures on description update
- Add short-description parameter for better Docker Hub metadata
- Ensure Docker image publishing succeeds even if description update fails

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: Stewart86

.github/workflows/docker-publish.yml

@@ -60,3 +60,5 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
           repository: ${{ env.IMAGE_NAME }}
           readme-filepath: ./README.md
+          short-description: "AI-powered Discord bot for codebase analysis and bug detection"
+        continue-on-error: true