Show built in environment variables when listing env vars

[tzmanics]

$ modulus env list should show the built-in environment variables (where possible).

[theworkflow]

Is this request to include env vars that are not related to the CLI (stored in a user's shell configuration)?

[theworkflow]

Just wanted to ping on this one... Refer to comment above

[jackboberg]

I believe this is in reference to the fact that we set additional environment variables at runtime that are not exposed in this CLI command, (eg: PORT, APP_DIR, or SERVO_ID).

[theworkflow]

Hm. I think those environment variables are exposed inside of the servo only...