Fix build process to follow official Debian backporting guidelines

- Add dch --bpo to add backport revision number as per Debian guidelines
- Add fakeroot debian/rules binary test build before main build
- Use dpkg-buildpackage --build=binary --unsigned-changes as recommended
- This follows the SimpleBackportCreation workflow from Debian wiki
- Should finally produce proper .deb binary packages

.forgejo/workflows/ci.yml

@@ -146,7 +146,20 @@ jobs:
             echo 'Changelog:'
             head -20 debian/changelog
 
-            # Build packages
+            # Add backport revision number (following Debian guidelines)
+            echo 'Adding backport revision number...'
+            dch --bpo || echo 'dch --bpo failed, continuing...'
+            
+            # Test build first (following Debian guidelines)
+            echo 'Testing build with fakeroot debian/rules binary...'
+            if fakeroot debian/rules binary; then
+              echo 'Test build successful!'
+            else
+              echo 'Test build failed!'
+              exit 1
+            fi
+            
+            # Build packages properly (following Debian guidelines)
             echo 'Building ostree packages...'
             echo 'Current directory before build:'
             pwd
@@ -159,9 +172,9 @@ jobs:
             dpkg -l | grep libfuse3-dev || echo "libfuse3-dev not found"
             dpkg -l | grep libsystemd-dev || echo "libsystemd-dev not found"
             
-            echo 'Running dpkg-buildpackage with verbose output...'
-            echo 'Forcing binary package build...'
-            if dpkg-buildpackage -us -uc --build=source,binary -v; then
+            echo 'Running dpkg-buildpackage with proper Debian backport flags...'
+            echo 'Using --build=binary --unsigned-changes as per Debian guidelines...'
+            if dpkg-buildpackage --build=binary --unsigned-changes; then
               echo 'Build successful!'
             else
               echo 'Build failed! Checking for any partial packages...'