pgadmin_ynh/conf/setup.exp

#!/usr/bin/expect
set timeout 20

set cmd [lindex $argv 0]
set path [lindex $argv 1]
set user [lindex $argv 2]

spawn $cmd $path

expect "Email address:"
send "$user\r";

expect "Password:"
send {__ADMIN_PASSWORD__};
send "\r";

expect "Retype password:"
send {__ADMIN_PASSWORD__};
send "\r";

interact