feat: integrate Forgejo Debian Package Registry for professional distribution

- Replace artifact upload with Debian Package Registry integration
- Add automatic package upload to Forgejo's native Debian repository
- Update README with apt repository installation instructions
- Provide multiple download methods: apt repo, direct download, and artifacts
- Enable users to install packages via standard apt commands
- Improve package distribution with version control and deduplication

This change transforms the package distribution from manual artifact downloads
to a professional Debian repository that users can add to their apt sources.

.forgejo/workflows/build-libostree-backport.yml

@@ -131,4 +131,29 @@ jobs:
           done
           
           echo "" >> release-assets/INSTALL.md
-          echo "Build completed on: $(date)" >> release-assets/INSTALL.md 
+          echo "Build completed on: $(date)" >> release-assets/INSTALL.md
+
+      - name: Upload to Debian Package Registry
+        run: |
+          # Upload each .deb package to Forgejo's Debian Package Registry
+          for deb_file in release-assets/*.deb; do
+            if [ -f "$deb_file" ]; then
+              echo "Uploading $deb_file to Debian Package Registry..."
+              # Extract package name and version
+              pkg_name=$(dpkg-deb -f "$deb_file" Package)
+              pkg_version=$(dpkg-deb -f "$deb_file" Version)
+              pkg_arch=$(dpkg-deb -f "$deb_file" Architecture)
+              
+              echo "Package: $pkg_name"
+              echo "Version: $pkg_version"
+              echo "Architecture: $pkg_arch"
+              
+              # Upload to Forgejo's Debian Package Registry
+              # This will be available at: https://git.raines.xyz/api/packages/robojerk/debian
+              curl -X POST \
+                -H "Authorization: token ${{ secrets.GITEA_TOKEN }}" \
+                -H "Content-Type: application/vnd.debian.binary-package" \
+                --data-binary "@$deb_file" \
+                "https://git.raines.xyz/api/packages/robojerk/debian/$pkg_name/$pkg_version/$pkg_arch"
+            fi
+          done