ci: add integration test workflow

.github/workflows/integration.yml

@@ -0,0 +1,25 @@
+name: Integration
+
+on: [push, pull_request]
+
+jobs:
+  Tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.8]
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install tox
+        shell: bash
+        run: pip install --upgrade tox
+
+      - name: Execute integration tests
+        shell: bash
+        run: tox -e integration