add github workflow

.github/workflows/run_tests.yaml

@@ -0,0 +1,57 @@
+name: Run tests
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  run-test:
+    # name: test-${{ matrix.python-version }}-${{ matrix.env }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      # run this job using this matrix, excluding some combinations below.
+      matrix:
+        os:
+          - "ubuntu-latest"
+          - "windows-latest"
+          - "macos-latest"
+        python-version:
+          - "3.8"
+          - "3.9"
+          - "3.10"
+          - "3.11"
+          - "3.12"
+          - "pypy-3.10"
+        env:
+          - py
+
+        include:
+          - os: "ubuntu-latest"
+            env: sqla14
+          - os: "ubuntu-latest"
+            env: sqla20
+          - os: "ubuntu-latest"
+            env: sqla21
+          - os: "ubuntu-latest"
+            env: pep484
+          - os: "ubuntu-latest"
+            env: pep8
+
+      fail-fast: false
+
+    # steps to run in each job. Some are github actions, others run shell commands
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Set up python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install tox
+        run: pip install tox
+
+      - name: Run tests
+        run: tox -e ${{ matrix.env }}