Add example on how to set up environment variables

[ibarrae]

Is your feature request related to a problem? Please describe.

Hey everybody, I would like to see an example of how to set up (global) environment variables on the VM so it's available during shell/cmd line usage. For instance, having some env var like FOO=123 available so I can do the following in the VM:

$ echo $FOO
123

Describe the solution you'd like

An example on how to set up environment variables in the VM

Describe alternatives you've considered

No response

Additional context

No response