Fix invalid repo reference in calls to GH api

[meeDamian]

In this case (line 66) we query the GH api and not docker.

Of course 🤦🏻‍♂️. It's a bug, and the ${SLUG} there should be changed to ${GITHUB_REPOSITORY}.

GH Actions are still in very active development. Things change all the time, and there's a bunch of odd behaviours (secrets not working in forks 🤷🏻‍♂️), so while I vaguely remember someone creating a way to run GH Actions locally, I think for now it might be better to just bruteforce them against the real thing :P.

I actually created a separate repo for myself where I can just quickly test how things work on them.

Originally posted by @meeDamian in #3 (comment)