Add Gally version to Image name in the Compose file

Author: shochdoerfer

docker-compose.gally.yaml

@@ -6,6 +6,7 @@ services:
 
   gally:
     container_name: ddev-${DDEV_SITENAME}-gally
+    image: ddev-${DDEV_SITENAME}-gally:${GALLY_VERSION}
     labels:
       com.ddev.site-name: ${DDEV_SITENAME}
       com.ddev.approot: ${DDEV_APPROOT}