CLI doesn't have config file like olm

[jrdemasi]

Describe the Bug

This is a security issue as the client id and secret are always available in /proc/<pid>/environ or in ps output.

Environment

• OS Type & Version: (e.g., Ubuntu 22.04) Any Linux distro
• Pangolin Version: Latest
• Gerbil Version: Latest
• Traefik Version: Latest
• Newt Version: Latest
• Client Version: (if applicable)

To Reproduce

Run pangolin CLI as per the docs provided (including systemd unit) on site, check ps auxf | grep -i pangolin output

Expected Behavior

If this is going to be used for config on Linux machines, there needs to be a mechanism for passing secrets that doesn't expose on CLI or otherwise