chore: CI 수정

Author: kon28289

.github/workflows/ci.yml

@@ -22,7 +22,21 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
-    services:
+    container:
+      image: eclipse-temurin:21-jdk
+      services:
+        mysql-geumpumta:
+          image: mysql:8.4.0
+          env:
+            MYSQL_DATABASE: geumpumta
+            MYSQL_USER: app
+            MYSQL_PASSWORD: app
+            MYSQL_ROOT_PASSWORD: root
+          # ports 매핑 불필요 (내부 통신이므로 3306으로 붙음)
+          options: >-
+            --health-cmd="mysqladmin ping -h 127.0.0.1 -proot"
+            --health-interval=10s --health-timeout=5s --health-retries=10
+
       redis:
         image: redis:alpine
         ports: