ci: update MariaDB environment variable and health check command in server tests workflow

Author: barredterra

.github/workflows/server-tests.yml

@@ -44,10 +44,10 @@ jobs:
       mariadb:
         image: mariadb:11.8
         env:
-          MYSQL_ROOT_PASSWORD: root
+          MARIADB_ROOT_PASSWORD: root
         ports:
           - 3306:3306
-        options: --health-cmd="mysqladmin ping" --health-interval=5s --health-timeout=2s --health-retries=3
+        options: --health-cmd="healthcheck.sh --connect --innodb_initialized" --health-interval=5s --health-timeout=2s --health-retries=3
 
     steps:
       - name: Clone