Allow setting env variables in config app

[qrhfz]

Description

i was having issue similar to #54 when jailing android studio. the solution is to set DISPLAY env var. it would be great if we can set it in the config app and then the env vars will added to .desktop file generated. so i don't need to open terminal just to open android studio.

[rusty-snake]

#94

[igo95862]

Hello @qrhfz

Isn't DISPLAY an X11 variable? (for example, DISPLAY=:0) The [x11] service should already pass it to the sandbox.

[qrhfz]

nvm, this is actually x11 shenanigan. it also happens on flatpak apps flatpak/flatpak#938

[igo95862]

So your /tmp/.X11 folder got deleted somehow?

[igo95862]

Also would be nice to have the error log you get when trying to run bubblejail with android studio.