ci: isolate MySQL test services

.gitea/workflows/ci.yml

@@ -8,6 +8,17 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    services:
+      mysql:
+        image: mysql:8.0.35
+        env:
+          MYSQL_ROOT_PASSWORD: ci-root-password
+          MYSQL_DATABASE: hulumath
+        options: >-
+          --health-cmd "mysqladmin ping -h 127.0.0.1 -uroot -pci-root-password --silent"
+          --health-interval 5s
+          --health-timeout 5s
+          --health-retries 20
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
@@ -31,28 +42,9 @@ jobs:
         run: python -c "from config.asgi import application; print(type(application).__name__)"
       - name: Unit tests
         run: pytest -q
-      - name: Start MySQL 8.0.35
-        run: |
-          docker rm -f hulumath-ci-mysql 2>/dev/null || true
-          docker run -d --name hulumath-ci-mysql \
-            -p 3307:3306 \
-            -e MYSQL_ROOT_PASSWORD=ci-root-password \
-            -e MYSQL_DATABASE=hulumath \
-            mysql:8.0.35 \
-            --character-set-server=utf8mb4 \
-            --collation-server=utf8mb4_0900_ai_ci
-          for i in $(seq 1 60); do
-            if docker exec hulumath-ci-mysql \
-              mysqladmin ping -h 127.0.0.1 -uroot -pci-root-password --silent; then
-              exit 0
-            fi
-            sleep 2
-          done
-          docker logs hulumath-ci-mysql
-          exit 1
       - name: MySQL migrations and tests
         env:
-          DATABASE_URL: mysql://root:ci-root-password@127.0.0.1:3307/hulumath
+          DATABASE_URL: mysql://root:ci-root-password@mysql:3306/hulumath
         run: |
           python backend/manage.py check --database default
           python backend/manage.py check_mysql