chore: implement GitHub Actions

.github/workflows/tox.yaml

@@ -0,0 +1,45 @@
+name: tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  tox:
+    name: ${{ matrix.platform.name }}
+    runs-on: "ubuntu-latest"
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - name: py38
+            python-version: "3.8"
+          - name: py39
+            python-version: "3.9"
+          - name: py310
+            python-version: "3.10"
+          - name: py311
+            python-version: "3.11"
+          - name: py312
+            python-version: "3.12"
+          - name: py313
+            python-version: "3.13.0-rc.1 - 3.13"
+          - name: pypy
+            python-version: "pypy-3.10"
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Set up python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.platform.python-version }}
+
+      - name: Install dependencies
+        run: |
+          pip install --upgrade pip
+          pip install --upgrade tox
+
+      - name: Run tox
+        run: tox