Automate trust of `.desktop` files

[chrisjsewell]

Currently, for the homepage/jupyterlab/aiidalab .desktop files on /home/max/Desktop, you have to manually authorize trust (by double-clicking on them in the GUI).

This should be able to be automated using gio set /home/max/Desktop/homepage.desktop "metadata::trusted" yes:

• https://askubuntu.com/a/1152748
• https://stackoverflow.com/a/57597821/5033292 (via ansible you also need to use dbus-launch)

(I tested this via the terminal on the VM and it looks to work, you have to refresh the screen with F5)