doc/examples: Don't wait for user to enter password

The example user setup script calls adduser which in turn calls passwd
to ask the user for a password; which waits indefinitely for user
input. Since we set the password noninteractively, disable adduser
from asking the user to set a password.

Fixes: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1006823
Signed-off-by: Christopher Obbard <chris.obbard@collabora.com>

doc/examples/setup-user.sh

@@ -3,7 +3,7 @@
 set -e
 
 echo "I: create user"
-adduser --gecos User user
+adduser --gecos User --disabled-password user
 
 echo "I: set user password"
 echo "user:user" | chpasswd