check formatting

.github/workflows/test_and_publish.yml

@@ -7,6 +7,16 @@ on:
     - cron: '0 2 * * 0' # Weekly on Sundays at 02:00
 
 jobs:
+  format:
+    name: Format
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Check format
+      uses: zalexki/php-cs-fixer-action@master
+
   test:
     name: PHP ${{ matrix.php }} / DB ${{ matrix.database }}
     strategy:
@@ -86,7 +96,7 @@ jobs:
   publish:
     name: Publish
     runs-on: ubuntu-latest
-    needs: test
+    needs: [format, test]
     if: github.event_name == 'push' && github.ref == 'refs/heads/master'
     steps:
     - uses: actions/checkout@master