Update manifest.json

If you don't set the "entry" port, then Docker would generate a random one and then, when executing Symfony Cli command, it fails.
This would let the user to just start your docker container and then update doctrine schema (or run migration) as `5432` is the port configured in the default `.env`

Author: flovntp

doctrine/doctrine-bundle/2.9/manifest.json

@@ -39,7 +39,7 @@
             "services": [
                 "database:",
                 "  ports:",
-                "    - \"5432\""
+                "    - \"5432:5432\""
             ]
         }
     },