Add lintje to CI

.github/workflows/ci.yaml

@@ -23,6 +23,8 @@ jobs:
         uses: actions/checkout@v4
       - name: Get dependencies
         run: mix deps.get
+      - name: Check git commit messages
+        run: script/lint_git
       - name: Check for compilation errors
         run: mix compile --warnings-as-errors
       - name: Check code formatting