Handle local env variable in SSH profile configuration

[woodmeal]

Is your feature request related to a problem? Please describe.
I've to deal with several SSH connections with the same user and I'd like to be able to just have to write $USER or something like this when I'm adding a new SSH profile.

Describe the solution you'd like
Adding an if statement to check if the first char is a $ and replace it by the env variable of the input would be the easiest solution though I'm not sure if it's possible to read env variables(that are not in a .env file) from an electron app.

[woodmeal]

I also thought about a checkbox under username to use the current user