This PR adds detection for podman container by checking the existence of /run/.containerenv. This is the recommended method as per podman run manpage:
[...] Additionally, an empty file is created in each container to indicate to programs they are running in a container. This file is located at /run/.containerenv.
This PR adds detection for podman container by checking the existence of
/run/.containerenv
. This is the recommended method as per podman run manpage:cc @WadeBarnes