I found the need to merge 2 Docker images
(e.g. intersystems/iris-community:2020.2.0.199.0 + my home grown NodeJS Image).
I found some advice on the Web but no real convincing solution.
It is basically not merging the images but merging (manually) the generating Dockefiles.
No problem with my own docker image (with sudo, editor, npm, nodejs, and root access ...)
But where could I get the Dockerfie that generated my IRIS distribution?
I managed to have a workaround and a usable working Docker image.
Bur this was handcrafted by try & error. Not what I intended!
Suggestions are very welcome