Port, user, platform
- Serve HTTP on
$PORT: the port in the project's settings, else the one port the image exposes, else 8080. - An image with no non-root
USERruns as uid 10001, group 0. linux/amd64only; a push for another platform is refused.- A
CMDorENTRYPOINTstarts the server. - The filesystem is read-only apart from
/tmp.