also re-create admin if it was deleted

Author: ghostwheel42

demo/admin-pw.sh

@@ -1,3 +1,3 @@
 #!/bin/bash
 cd /opt/infra/demo
-/usr/local/bin/docker-compose exec admin flask mailu password admin test.mailu.io letmein >/dev/null
+/usr/local/bin/docker-compose exec admin flask mailu admin --mode update admin test.mailu.io letmein >/dev/null