add ci pipeline

.github/workflows/ci.yaml

@@ -0,0 +1,49 @@
+name: Testing
+on:
+  pull_request:
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install dependencies
+        run: python3 -m pip install tox
+      - name: Run linters
+        run: tox -e lint
+  unit-test:
+    name: Unit tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install dependencies
+        run: python -m pip install tox
+      - name: Run tests
+        run: tox -e unit
+  security-test:
+    name: Security tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install dependencies
+        run: python -m pip install tox
+      - name: Run tests
+        run: tox -e security
+  integration-test:
+    name: Integration tests (microk8s)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup operator environment
+        uses: charmed-kubernetes/actions-operator@main
+        with:
+          provider: microk8s
+          # This is needed until https://bugs.launchpad.net/juju/+bug/1977582 is fixed
+          bootstrap-options: "--agent-version 2.9.29"
+      - name: Run integration tests
+        run: tox -e integration