Fix: Import Docker env vars into VNC session

Systemd services don't inherit container environment variables.
Added sourcing from /proc/1/environ in xstartup to fix this.

apps/rego-tunnel/shared/xstartup

@@ -4,6 +4,12 @@
 unset SESSION_MANAGER
 unset DBUS_SESSION_BUS_ADDRESS
 
+# Import environment variables from container (PID 1)
+# Systemd services don't inherit Docker env vars, so we source them here
+while IFS= read -r -d '' line; do
+    export "$line"
+done < /proc/1/environ
+
 export XDG_RUNTIME_DIR=/tmp/runtime-root
 mkdir -p $XDG_RUNTIME_DIR
 chmod 700 $XDG_RUNTIME_DIR