use Github Actions run CI

.github/workflows/main-ci.yml

@@ -0,0 +1,19 @@
+name: Docker Image CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php_version: [72, 73]
+        service: [php-fpm, php-worker]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build the Docker image
+      env:
+        PHP_VERSION: ${{ matrix.php_version }}
+      run: |
+        cp env-example .env
+        docker-compose build ${{ matrix.service }}