Oh dear, Last time this happened was 11 days ago when more than just packages went down. [0] Perhaps relying and going all in on GitHub doesn't seem to be good in the long run. Especially GitHub Actions.
This is where OpenAI is now feeling the effects of instability [1] on Azure since their recent outage. I expect them to also have issues like GitHub has every month.
Packages had an incident two days ago, also: https://www.githubstatus.com/incidents/sn4m3hkqr4vz. I noticed it when a Terraform provider download was failing, citing a 404 from objects.githubusercontent.com.
Microsoft, historically, has not had much competitive pressure to be reliable. For decades, they've had a lock on the PC OS market, and there basically is no larg2 business that doesn't rely on MS. Even world governments rely on MS.
Now even in the few areas where MS actually does have this pressure (e.g. Azure) they're struggling to make it part of the culture.