Fix port mapping

Author: Rahe

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
           MYSQL_ROOT_PASSWORD: root
           MYSQL_DATABASE: wordpress_test
         ports:
-          - 3306/3306
+          - 3306:3306
         options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3
     strategy:
       matrix: