I ran the renpy linter locally and had 80 files linted with some statistics. When run through the github action it says 0. To help with debugging the difference it would be helpful to have a more complete console log. Since the default location is . the location prints out .... which is a little confusing.

Something like:
Linting the project at <root>/<input> would be a little more clear
TBH not sure if the root helps at all with github actions, but removing the trailing ... would be great.