I tried with ${GITHUB_SHA} but for some reason is it not turned into the actual SHA.

Idk why this happens but I had this many times before on other workflows and never found a solution nor cause for it.
Also, to be clear: I tried ${GITHUB_SHA} but also {GITHUB_SHA} and also with spaces but no changes.

First of, the paragraph I quoted says that GITHUB_SHA (and thus github.sha, it’s the same, just as an Actions variable, not shell) is not what you want, and it says what to use instead. Please read it again. 🙂

Secondly, ${NAME} is shell syntax, so whichever variable you use it’s only going to work in a shell context (e.g. a run step using Bash).

Okay, yeah. I missread that, so my bad.

I figured this out a little later myself, so it works now like I want it to.