Update .forgejo/workflows/build.yml

.forgejo/workflows/build.yml

@@ -12,12 +12,14 @@ jobs:
     steps:
       - uses: https://git.swee.codes/swee/setup-alpine@main
         with:
-          additional: python3 libxml2-utils
+          additional: python3 libxml2-utils ruff
       - uses: actions/checkout@v4
       - name: Check syntax of Python file
         run: python3 -m py_compile sweecrypt-gtk.py
       - name: Check syntax of XML file
         run: xmllint --format sweecrypt-gtk.ui
+      - name: Lint python files
+        run: ruff check
   x11:
     name: Test the application
     runs-on: alpine