Ensure matrix-postgres.service is started before creating additional users/databases

roles/matrix-postgres/defaults/main.yml

@@ -42,3 +42,9 @@ matrix_postgres_container_postgres_bind_port: ""
 #     username: matrix_appservice_slack
 #     password: some_password
 matrix_postgres_additional_databases: []
+
+# The number of seconds to wait after starting `matrix-postgres.service`
+# and before trying to run queries for creating additional databases/users against it.
+#
+# For most (subsequent) runs, Postgres would already be running, so no waiting will be happening at all.
+matrix_postgres_additional_databases_postgres_start_wait_timeout_seconds: 15