mysql integration test fix: looks like we do need this (#5078)

docker-compose.integration-tests.yml

@@ -22,6 +22,21 @@ services:
     ports:
       - "0.0.0.0:6432:5432"
 
+  mysql-test:
+    image: mysql:9
+    platform: linux/amd64
+    restart: always
+    environment:
+      - MYSQL_HOST=mysql_example
+      - MYSQL_DATABASE=mysql_example
+      - MYSQL_ROOT_PASSWORD=example
+      - MYSQL_USER=mysql_user
+      - MYSQL_PASSWORD=mysql_pw
+    expose:
+      - 3306
+    ports:
+      - "3306:3306"
+
   sqlserver-test:
     image: mcr.microsoft.com/azure-sql-edge:latest # Equivalent to SQL Server 2016
     environment:
@@ -31,5 +46,3 @@ services:
       - 1433
     ports:
       - "0.0.0.0:1433:1433"
-
-  # mysql integration test config lives at `docker/docker-compose.integration-mysql.yml`