The incident has been resolved by GitHub.

GitHub has now acknowledged their issue on their status page: https://www.githubstatus.com/incidents/djpyjb19cfjd

We’re continuing to monitor the situation and exploring mitigations on our end.

We are experiencing general degraded performance. We’re working to resolve the problem as quickly as we can. We’ll share another update shortly.

A subset of BuildJet for GitHub Actions users are impacted.