feat: ability to specify docker org for baseimg

[russkel]

At the moment nvidia is being slow at pushing out ubuntu 22.04 cudagl images and we've been forced to create our own. This patch lets users use their own organisation images instead of nvidia's.

This adds a -baseorg argument to the build command.

[slonopotamus]

I'm +1 on the spirit of this PR (make base image more configurable), bit -1 on actual implementation. It makes more sense to make base image fully configirable. Many usecases do not involve rendering at all and would happily use ubuntu-nn.mm for exame, without any connection to nvidia stuff.

[russkel]

I agree. I did this quick hack because I needed to quickly move on. Specifying the image in entirety is likely a better move.

[russkel]

I will remake this to make it a baseimg override instead.

[patrick-5546]

I think changing the base image to nvidia:cuda instead of nvidia:cudagl also works:

• Update CUDA repository GPG keys on Ubuntu 18.04 #294 (comment)

[russkel]

@patrick-5546 thanks a lot for bringing this to my attention. I have changed my build to use cuda now. You should create a PR for it ;).