Hey team, we’ve been seeing build failures for builds extending longer than 15 mins due to degraded performance for self hosted runners. This started yesterday, and was reported by the general community about 10 hours ago. Github just became aware of this about 30 mins ago.
Follow here for the action:
https://github.com/actions/runner/issues/1546
Status page:
https://www.githubstatus.com/
I too lost a couple of hours today scratching my head until I found the issue. Sorry for the trouble!