Unset NOTIFY_SOCKET when running the temporary server. (#1325)

* Unset NOTIFY_SOCKET when running the temporary server.

Postgres has native support for this notification socket and will write a `READY=1` message once it is ready and accepting connections. Unfortunately, the temporary server used by the `docker-entrypoint.sh` also sends a message on the socket, making it appear as though the container is ready and serving connections when it is not.

Author: plietar

13/alpine3.20/docker-entrypoint.sh

@@ -269,6 +269,9 @@ docker_temp_server_start() {
 	# does not listen on external TCP/IP and waits until start finishes
 	set -- "$@" -c listen_addresses='' -p "${PGPORT:-5432}"
 
+	# unset NOTIFY_SOCKET so the temporary server doesn't prematurely notify
+	# any process supervisor.
+	NOTIFY_SOCKET= \
 	PGUSER="${PGUSER:-$POSTGRES_USER}" \
 	pg_ctl -D "$PGDATA" \
 		-o "$(printf '%q ' "$@")" \