Add opt-in GUI and audio support

.claudio

@@ -12,6 +12,13 @@ MOUNTS=(
     # "$PWD/../sibling-project"
 )
 
+# GUI=1: graphical apps show up on your desktop (host Wayland socket + GPU).
+#        On KDE Plasma this also lets them control input, the screen and clipboard.
+# AUDIO=1: apps can play sound through the host's PulseAudio/PipeWire socket.
+#          This also lets them record from your microphone.
+GUI=0
+AUDIO=0
+
 # Extra `podman run` options (env vars, ports, resources, ...).
 PODMAN_ARGS=(
     # -e GITHUB_TOKEN