group id not set in docker-custom/Dockerfile.custom (v1.1.3)

Hi, in docker-custom/Dockerfile.custom no group id is created or assigned to the user node-red. It defaults to the root group. This creates permission problems when running something like,

docker run  --rm  --user=$UID  -it -p 1880:1880 -v /home/user/.node-red:/data  --name mynodered nodered/node-red

as the permissions in the host directory /home/user/.node-red, become mangled.

Adding something like the following seems to address it,

: xps 0 %; git diff
diff --git a/docker-custom/Dockerfile.custom b/docker-custom/Dockerfile.custom
index 018648e..c084498 100644
--- a/docker-custom/Dockerfile.custom
+++ b/docker-custom/Dockerfile.custom
@@ -21,11 +21,10 @@ RUN set -ex && \
         openssh-client && \
     mkdir -p /usr/src/node-red /data && \
     deluser --remove-home node && \
-    adduser -h /usr/src/node-red -D -H node-red -u 1000 && \
-    chown -R node-red:root /data && chmod -R g+rwX /data && \ 
-    chown -R node-red:root /usr/src/node-red && chmod -R g+rwX /usr/src/node-red
-    # chown -R node-red:node-red /data && \
-    # chown -R node-red:node-red /usr/src/node-red
+    addgroup  --gid 1001  node-red  && \
+    adduser -h /usr/src/node-red -D -H node-red  -u 1001  -G node-red  && \
+    chown -R node-red:node-red /data && \
+    chown -R node-red:node-red /usr/src/node-red
 
 # Set work directory
 WORKDIR /usr/src/node-red

Start with docker-custom/Dockerfile.custom and compare the node-red user and group setup with the reported docker run command. Verify that the image assigns node-red to its own group and that the mounted /home/user/.node-red files no longer receive root-group permissions.