Update Playwright Admin Workflow to Use External MySQL Configuration

- Removed inline MySQL character set and collation options from the workflow file.
- Added a new my.cnf configuration file to specify MySQL settings including default-authentication

.github/workflows/playwright_admin.yml

@@ -15,8 +15,6 @@ jobs:
         ports:
           - '3306:3306'
         options: >-
-          --character-set-server=utf8mb4
-          --collation-server=utf8mb4_unicode_ci
           --health-cmd="mysqladmin ping --silent"
           --health-interval=10s
           --health-timeout=5s
@@ -26,6 +24,8 @@ jobs:
           MYSQL_DATABASE: digital
           MYSQL_USER: root
           MYSQL_PASSWORD: password
+        volumes:
+          - ./my.cnf:/etc/mysql/conf.d/my.cnf
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4

my.cnf

@@ -0,0 +1,4 @@
+[mysqld]
+default-authentication-plugin=mysql_native_password
+character-set-server=utf8mb4
+collation-server=utf8mb4_unicode_ci