matrix-docker-ansible-deploy/roles/matrix-server/templates/usr-local-bin/matrix-synapse-register-user.j2

#!/bin/bash

if [ $# -ne 3 ]; then
        echo "Usage: "$0" <username> <password> <admin access: 0 or 1>"
        exit 1
fi

user=$1
password=$2
admin=$3

extraFlags=""

if [ "$admin" -eq "1" ]; then
        extraFlags=$extraFlags" -a"
fi

docker exec matrix-synapse register_new_matrix_user -u $user -p $password $extraFlags -c /data/homeserver.yaml https://localhost:8448