Fix Github Action docker reference

[tlfbrito]

According to Github Actions documentation, we should reference the docker image directly from the project: https://docs.github.com/pt/actions/creating-actions/creating-a-docker-container-action#creating-an-action-metadata-file

This fixes: #26

[emily-hawkins]

hi @tlfbrito! do you know when this fix will be implemented? im running into the issue from #26 and trying to get this set up in github actions

[tomsej]

Sorry guys. I was solving some family issues. Will look into this tomorrow!

[tomsej]

Ohh cool I did not know that it is possible. Thank you @tlfbrito