It appears when you trigger an action from a push this morning, various essential variables are missing; GITHUB_SHA is undefined, the base ref is undefined. This means if you run an action on a branch, the “checkout” action will accidentally checkout master. If you try to push a docker image or some other artifact to some external server and the name is based on the SHA, the SHA will just be an empty string.
Thanks for letting us know, and sorry for the inconvenience. We’re working on this now.