I am seeing similar to the nothing to commit, working tree clean issue here: #10 (comment), and it does not seem to be due to line-ending settings
I made a PR, with the config file similar to given there, and also added extra spaces to a code file, so that the format would have something to fix.
The result is that it is formatted on the format step,
and this is followed by "nothing to commit, working tree clean" at the commit step
