Fixed port removal when docker is start with --ip with an IP other than 0.0.0.0

dokku

@@ -64,7 +64,7 @@ case "$1" in
     # start the app
     DOCKER_ARGS=$(: | pluginhook docker-args $APP)
     id=$(docker run -d -p 5000 -e PORT=5000 $DOCKER_ARGS $IMAGE /bin/bash -c "/start web")
-    port=$(docker port $id 5000 | sed 's/0.0.0.0://')
+    port=$(docker port $id 5000 | sed 's/[0-9.]*://')
 
     # if we can't post-deploy successfully, kill new container
     function kill_new {