Update dockerfile to allow user to create output files not owned by root

[pwright]

The exister dockerfile creates output as root. This makes life difficult for ordinary users who run this this docker file to create html.
However, my proposal isn't ideal, it means that the user must allow nobody write access to the docs repo before running the container.
I'm happy to chmod a+rwx before running the container, but maybe others wouldn't want to do that.

[bexelbie]

@finp I believe we should consider documenting around this. If you execute the container with this command, I believe you will find that your files are owned by your user:group:

docker run --rm -it -v pwd:/docs:z -u $(id -u):$(id -g) asciibinder

Would you be interested in helping document this? or modifying your PR to document it in file?

[pwright]

@bexelbie Yes, that makes sense, altho your syntax didn't work for me.
I've created a PR for this (as part of larger PR to get writer using asciibinder in minutes, without messing up ccutil). It's here
redhataccess/ascii_binder-docs#18
and this particular issue addressed here:
https://19-114003413-gh.circle-artifacts.com/0/home/circleci/docs/_preview/ascii_binder/latest/getting_started/building.html#building-using-docker

[bexelbie]

@finp I'll look at the other PR as soon as I can. What is broken with the syntax? Are you on a non-Linux machine?

[pwright]

@bexelbie I'm on fedora (weird huh!)... I had to change the volume syntax to get it to work:
You: -v pwd:/docs:z
Me: -v ${PWD}:/docs:z

[bexelbie]

doh! that'll teach me to type and not cut and paste. good catch @finp

[pwright]

closing in favor of redhataccess/ascii_binder-docs#18 (ie documentation change rather than dockerfile change)