Add github action

.github/workflows/test.yml

@@ -0,0 +1,26 @@
+name: "CI"
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  run:
+    name: "tests & coverage"
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v5
+      with:
+        python-version: 3.8
+
+    - name: Install hatch
+      run: |
+        python -m pip install hatch
+
+    - name: Tests
+      run: hatch run test