Use higher value for mambauser UID/GID

[wholtz]

Ubuntu added a new account to the lunar release and it has UID 1000. We currently use UID 1000 for mambauser. With our current Dockerfile, the build of with ubuntu:lunar as the base image fails.

Some possible ways forward:

1. Wait until micromamba v1.5.0 is released and at that time move mambauser to UID 10000 and add in ubuntu:lunar as a base image.
2. Add conditional logic to setting MAMBA_USER_ID such that it remains at 1000 for existing base images and is 10000 for ubuntu:lunar based images.

[maresb]

Perhaps we could do both: add conditional logic for ubuntu:lunar now and then change the default to 10000:10000 on the next minor release?

[wholtz]

Done in #344 #345 using conditional logic for lunar. I decided to use 57439 for the new uid/gid instead of 10000 in order to reduce the likelihood that we end up with another uid collision in the future. When micromamba v1.5.0 releases, I'd still like to get all our images using the the same UID and GID for mambauser. I will work on getting this change on the dev branch so it is ready to go.

[maresb]

Sounds great! Although 57439 is perhaps a bit extreme. I wonder if we should set environment variables so people writing Dockefiles don't have to remember.

[wholtz]

On most modern unix system, UID/GID are unsigned 32-bit integers. So I felt I wasn't going too crazy with my value. The real reason for my choice is that alpine only uses an unsigned 16-bit integer.

Yes, setting an environmental variable is a good idea.

[luabida]

I'm also facing this issue. I'm not sure if it's a Kubuntu standard, but my user also has 1000:1000 uid and gid. For now I'm changing my id, but it may turn to be an issue to more users in the future.

[wholtz]

@luabida - can you please tell me more about what you are doing when you run into this conflict. Are you using our Dockerfile to add micromamba to a kubuntu image? Or are you directly making use of one of our published images?

[luabida]

@wholtz of course, here is the Dockerfile. I'm using the rootless container approach to create the container user

In my shell:

id $USER
uid=1000(bida) gid=1000(bida) groups=1000(bida)

[maresb]

@wholtz, is this happening now that 1.5.0 is out?

[wholtz]

Yes, the 1.5.0 images are building right now and they are all using 57439 for UID/GID. I also added environmental variables for those values as you requested.

[maresb]

That's amazing, thank you!!!

[wholtz]

Done in 8491dcc