Add tests to github.

.github/workflows/tox.yaml

@@ -0,0 +1,42 @@
+---
+name: Tox
+
+on:
+  pull_request:
+  push:
+    branches:
+      - "main"
+    tags:
+      - "v*"
+
+jobs:
+  test:
+    name: test ${{ matrix.py }} - ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - Ubuntu
+        py:
+          - "3.11"
+          - "3.12"
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup python for test ${{ matrix.py }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.py }}
+      - name: Install Poetry
+        uses: snok/install-poetry@v1
+        with:
+          version: 1.4.2
+      - name: Install test dependencies.
+        run: python -m pip install 'tox>=4.0.16' 'tox-gh' 'urllib3<2'
+      - name: Install tox-docker
+        run: python -m pip install --pre tox-docker
+      - name: Run test suite
+        run: tox run
+        env:
+          PYTEST_ADDOPTS: "-vv --durations=10"