Demo container - Support rootless kit

[matthew-l-weber]

Some background:

• The current Makefile uses a container to run commands which simplifies the environment dependencies - https://github.com/elisa-tech/wg-aerospace/blob/main/demos/copilot/src/monitors/Makefile#L3
• The container is launched to run commands and files are mapped in for use. The entrypoint of the container is setup to make the file ACLs transparent by passing in your uid/guid info. e.g. you don't end up with files created in the container which would have invalid ownership "outside of the container". By going to rootkit, you wouldn't pass those -e values in, however we still need to verify the file ownership of content mapped in (-v items) is maintained after the container stops.
• Note, at the top of the Makefile there is a runtime check to see if we were running in a "xfs" environment, that check can still be used and when we are in the "xfs" configuration we should use the rootkit approach. (Suggest this could be a env variable to make it optional for users that need to run rootless)

Here's an example of a starting point to changes that could be folded in. It assumed just changing the values and not accomodating when to use the rootkit as mentioned above.

The most basic test case for this is to do a make dev to open a container shell and touch a file in /demo. Then exit the container shell and look at the ../demo folder to see what the file ownership looks like.

[matthew-l-weber]

@ivanperez-keera anything else to add?