Add hatch gh wokflow

.github/workflows/hatch.yml

@@ -0,0 +1,21 @@
+name: Hatch workflow
+on:
+  push:
+    paths:
+      - 'hatch-demo/**'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - name: Install Hatch
+        uses: pypa/hatch@install
+      - name: Lint
+        run: hatch run dev:check
+      - name: Run tests
+        run: hatch run dev:test