Add test of github actions

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: CI
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - github-ci
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v2
+
+    - name: Build Docker image for testing
+      run: |
+        docker build --target test -t zephir-api2:test .
+
+    - name: Run tests
+      run: |
+        docker run --rm zephir-api2:test
+
+    - name: Upload test results
+      if: always()
+      uses: actions/upload-artifact@v3
+      with:
+        name: pytest-results
+        path: ./tests