Add a gitea action

.gitea/workflows/test.yaml

@@ -0,0 +1,20 @@
+name: Testing
+on: [push]
+
+jobs:
+  default:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Install dependencies
+        run: |
+          apt-get update
+          apt-get install -yq --no-install-suggests --no-install-recommends \
+          python3-dev python3-pip python3-venv python-is-python3
+          pip install setuptools wheel
+          pip install --upgrade pip tox virtualenv
+      - name: Check out repository code
+        uses: actions/checkout@v3
+      - name: Quick lint
+        run: tox -e lint-basic
+      - name: Run tests
+        run: tox