Allow setting env vars #61
Description
On some linux distros the Unity Editor starts without display scaling applied, rendering the UI pretty unreadable without a magnifying glass.
It can be fixed by starting the (original) hub with GDK env vars like this:
exec env GDK_SCALE=1 GDK_DPI_SCALE=1.0 "$SCRIPT_DIR/unityhub-bin" "$([[ $UNPRIVILEGED_USERNS_ENABLED == '' || $UNPRIVILEGED_USERNS_ENABLED == 0 ]] && echo '--no-sandbox')" "$@"
(see https://discussions.unity.com/t/no-ui-scaling-for-linux-you-gotta-be-joking/1638248/30 and the whole thread for a lively discussion of this issue)
For UnityHubNative it also kinda works by starting it the same way. It results in tiny UI within the hub itself but the Editor's UI is scaled-up now.
Long story short: If there was a way to set env vars passed to the launched Editor app, it should work great.