Anyone using Docker?

Please don't misunderstand me - I do really appreciate your assistance, And I agree with your logic.
I can see where you are going by questioning my objectives. Let me put it this way; The whole thing began when I stumbled across this post:

https://discourse.nodered.org/t/edit-displays-if-a-new-node-red-update-is-available-online-and-update-it-from-the-dashboard

And quickly discovered that the "project" failed when NR was installed as a container. Then I began investigating why (again - just for the learning experience).
I did post my question in that thread too - but with no response.
I still have a distinct feeling that there must be an easy way around this issue. Perhaps by adding user node-red to the root group during deployment (or something like that).