Add MySQL server for test cases

.github/workflows/dotnet.yml

@@ -10,10 +10,20 @@ jobs:
     runs-on: ubuntu-latest
 
     strategy:
-      fail-fast: false
       matrix:
         dotnet-version: [ 6.0.x, 7.0.x, 8.0.x, 9.0.x ] # Test on multiple .NET versions
 
+    services:
+      mysql:
+        image: mysql:latest
+        env:
+          MYSQL_ALLOW_EMPTY_PASSWORD: yes
+          MYSQL_DATABASE: gang
+          MYSQL_USER: root
+        ports:
+          - 3306:3306
+        options: --health-cmd="mysqladmin ping --silent" --health-interval=10s --health-timeout=5s --health-retries=3
+
     steps:
       - uses: actions/checkout@v4
 
@@ -30,6 +40,13 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-nuget-
 
+      - name: Wait for MySQL
+        run: |
+          until mysqladmin ping -h "localhost" --silent; do
+            echo "Waiting for database connection..."
+            sleep 2
+          done
+
       - name: Restore dependencies
         run: dotnet restore