[PC-333] fix: 통합 테스트를 위한 깃허브 액션 Runner MySQL 설정

Author: devchlee12

.github/workflows/pr-test.yml

@@ -25,6 +25,12 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-gradle-
 
+      - uses: samin/mysql-action@v1
+        with:
+          mysql version: '8.0'
+          mysql database: 'dating-service-db'
+          mysql root password: ${{ secrets.DB_PASSWORD }}
+
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew