add x2go/xfce-debian docker image

* VDI server with temporary encrypted /home

docker/x2go/xfce-debian/run.sh

@@ -0,0 +1,51 @@
+#!/bin/sh
+### every exit != 0 fails the script
+set -eu
+
+if [ ! -f /app/.setup_done ]; then
+  /app/setup.sh
+  /app/setup_locales.sh
+  /app/setup_sshd.sh
+  /app/setup_timezone.sh
+fi
+
+# /home is mounted in RAM and does not survive on restart
+/app/setup_ecryptfs.sh
+/app/setup_users.sh
+
+## Start-up our services manually (since Docker container will not invoke all init scripts).
+## However, some service do start automatically, when placed and NOT-hidden in: /etc/xdg/autostart folder.
+
+# Start SSH daemon
+service ssh start
+# Start dbus system daemon
+service dbus start
+# Start syslog (for debugging reasons)
+service rsyslog start
+# prevent fail2ban to fail starting
+touch /var/log/auth.log
+# prevent fail2ban to fail restarting
+rm -f /var/run/fail2ban/fail2ban.sock
+# Start fail2ban (for security reasons)
+service fail2ban start
+
+cleanup() {
+  /bin/umount -fl /home
+  service dbus stop
+  service fail2ban stop
+  service rsyslog stop
+  service ssh stop
+  kill $PID 2>/dev/null
+  exit
+}
+
+trap "cleanup" INT TERM
+
+if [ $# -eq 0 ]; then
+  exec tail -f /dev/null &
+  PID=$! && wait
+else
+  # WARNING: cleanup is not called
+  exec /bin/bash -c "set -e && $@"
+fi
+cleanup