nixos/tests/sway: test GPG's pinentry pop-up

[primeos]

This test is important to confirm that $WAYLAND_DISPLAY is correctly
imported via "dbus-update-activation-environment --systemd" which is
done by default since #122605 (00e8e5b).
It ensures that the gnome3-pinentry pop-ups work as expected to avoid
regressions like #119445 (which also broke screen sharing).

Motivation for this change

Screenshot:

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[primeos]

@ofborg test sway

[Synthetica9]

Nice! Works for me.

(that screenshot reminds me, do we want a nice default NixOS wallpaper on Sway?)

[primeos]

(that screenshot reminds me, do we want a nice default NixOS wallpaper on Sway?)

A nice wallpaper would be nice but I'd prefer to go with the default NixOS wallpaper (it was on my TODO list for a long time but requires isNixOS from #122605 so that we can use the correct path in the default configuration, copy their wallpaper to an additional output and link to that via /run/current-system/sw/share/wallpaper or so - I haven't figured out the details yet so feel free to give it a go if you want - it might be a bit tricky to get it right though :o).