update container config to access mysql

- added DATABASE_URL in the php service environment
Hopefully, it will help us with accessing MySQL in Codespaces

- open 3306 mysql port in devcontainer.json

Author: hubertnguyen

.devcontainer/devcontainer.json

@@ -41,7 +41,7 @@
 		}
 	},
 
-	"forwardPorts": [80],
+	"forwardPorts": [80,3306],
 
 	// execute our one-time repo init if /vendor/ does not exist
 	"postCreateCommand": "sh init_repo.sh"

.devcontainer/docker-compose.yml

@@ -42,6 +42,10 @@ services:
       - ${PHP_WEBROOT_HOST_PATH}:${PHP_WEBROOT_CONTAINER_PATH}
     # we don't need to expose the port 9003 here for Xdebug because the 
     # connection comes from inside the PHP container to the IDE via port 9003
+    environment:
+      - DATABASE_URL=mysql://root:rootpassword@mysql:3306/mydatabase
+    depends_on:
+      - mysql
 
   # MySQL Service
   mysql: