Add Podman Build Instructions

[Oglopf]

Currently using podman and expecting drop in behavior to work using an alias in the .bashrc led to a surprised here.

The following command to build the container using docker will not actually work with podman:

docker run --rm -i -t -v "${PWD}:/doc" -u "$(id -u):$(id -g)" ohiosupercomputer/ood-doc-build make html

Instead, we need to alter some flags here and run:

podman run --rm=true -v $PWD:/doc --userns=keep-id --security-opt label=disable ohiosupercomputer/ood-doc-build:v2.0.0 make html

Instead. The use of -u and -userns being the difference between the APIs that causes the problem.

Add the command to the instructions to avoid the issue for any podman users in the future.

┆Issue is synchronized with this Asana task by Unito