fix(ci): fix build-deb function for shared-workflows compatibility

run

@@ -92,16 +92,25 @@ function build-deb {
   # Set up environment
   dev-env
 
-  export DEBEMAIL="info@hatlabs.fi"
-  export DEBFULLNAME="Hat Labs CI"
-  export PACKAGE_VERSION=$(release-version)
-  DEB_VERSION=$(echo "$PACKAGE_VERSION" | sed 's/-\([a-zA-Z]\)/~\1/g')
-
-  # Create a new changelog entry
-  dch --newversion "$DEB_VERSION" \
-      --distribution stable \
-      --force-distribution \
-      "Automated release $PACKAGE_VERSION. See GitHub for details."
+  # Check if changelog was already generated by CI (shared-workflows)
+  # If debian/changelog exists and was modified in the last 5 minutes, skip regeneration
+  if [ -f "debian/changelog" ]; then
+    CHANGELOG_AGE=$(($(date +%s) - $(stat -c %Y debian/changelog 2>/dev/null || stat -f %m debian/changelog)))
+    if [ "$CHANGELOG_AGE" -lt 300 ]; then
+      echo "📋 Using existing debian/changelog (generated by CI)"
+    else
+      # Generate changelog for local builds
+      export DEBEMAIL="info@hatlabs.fi"
+      export DEBFULLNAME="Hat Labs CI"
+      export PACKAGE_VERSION=$(cat VERSION)
+      DEB_VERSION=$(echo "$PACKAGE_VERSION" | sed 's/-\([a-zA-Z]\)/~\1/g')
+
+      dch --newversion "$DEB_VERSION" \
+          --distribution stable \
+          --force-distribution \
+          "Automated release $PACKAGE_VERSION. See GitHub for details."
+    fi
+  fi
 
   dpkg-buildpackage -us -uc -b