Add the ability to update user passwords with ansible (when using the matrix-postgres container).

roles/matrix-postgres/templates/usr-local-bin/matrix-postgres-update-user-password-hash.j2

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+if [ $# -ne 2 ]; then
+	echo "Usage: "$0" <username> <password_hash>"
+	exit 1
+fi
+
+docker run \
+	--rm \
+	--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
+    --cap-drop=ALL \
+	--env-file={{ matrix_postgres_base_path }}/env-postgres-psql \
+	--network {{ matrix_docker_network }} \
+	{{ matrix_postgres_docker_image_to_use }} \
+	psql -h {{ matrix_postgres_connection_hostname }} -c "UPDATE users set password_hash='$2' WHERE name = '@$1:{{ matrix_domain }}'"