[GitHub Actions]: Create Artifact Container failed: Artifact storage quota has been hit. Unable to upload any new artifacts
Solution 1:
There is no way to undo. The quota is monthly, so you just have to wait for quota reset.
Github Actions (runner time) and Github Storage (artifacts) should have separate quotas.
For Github Actions, I know they are free for public repositories, so you could change your repository visibility, at least temporarily if you need it. As for Github Storage, I'm not sure if the same trick works, never tested.
Let me know and I can update the answer.