serve Add `NO_UPDATE_CHECK` to readme

Document the use of the NO_UPDATE_CHECK environment flag from PR https://github.com/vercel/serve/pull/457 in the readme.md documentation.

The Cypress GitHub action ran into the issue https://github.com/cypress-io/github-action/issues/657 when using serve to start two instances in parallel which caused the error message
"[Error: EEXIST: file already exists, mkdir '/tmp/update-check']". It was not easy to find the underlying cause and solution.

The workaround is to browse through existing issues and PRs in this repository.

Dec 10 '22 09:12 MikeMcC399

Stale issue

Sep 21 '23 08:09 MikeMcC399

I think this issue should be reopened as NO_UPDATE_CHECK is not mentioned anywhere other than the source code

Jun 12 '24 13:06 tiagojufr

@tiagojufr

I think this issue should be reopened as NO_UPDATE_CHECK is not mentioned anywhere other than the source code

I have re-opened it, however it seems like there is nobody really responding here.

Jun 12 '24 13:06 MikeMcC399

Closing as stale issue with no response during last 2 years.

Jan 23 '25 08:01 MikeMcC399