Check alternative locations for .restyled.yaml

[pbrisbin]

Check the following in order, first found is used.

• .restyled.yaml (current)
• .restyled.yml
• .github/restyled.yaml
• .github/restyled.yml

[chiroptical]

I was able to build and test restyler locally and would like to try to add this enhancement. I see https://github.com/restyled-io/restyler/blob/master/src/Restyler/Config.hs#L203, it should be a simple change using https://hackage.haskell.org/package/base-4.14.0.0/docs/Data-List.html#v:find. I'll need to think more carefully about how to test it.

[pbrisbin]

Sounds great! I'm happy to review any WIP, if you get started but have questions.

I'm not sure Data.List.find would be useful here, since you probably want to iterate over a list of paths in IO and halt on the first one that exists. I suspect you'd just want to change loadConfigFrom to accept [ConfigSource], and then configFile to configFiles.

For testing, there is a way to run an RIO App a with a mocked file system (example), which means you should be able to call loadConfigFrom with various files present and assert the desired outcomes.