ci: use autofix.ci

[scarf005]

Summary

SUMMARY: Infrastructure "Apply automated formatting commit to PRs using autofix.ci to improve PR formatting experience"

Purpose of change

Details

Current method of fixing formatting issues on github is painful:

• has to click a lot to fix(commit) individual formatting errors
• spams PR with github actions comments, making it hard to distinguish from actual conversations

Describe the solution

used https://autofix.ci to automatically commit format fixes to PR.

Describe alternatives you've considered

disable reviewdog suggestion, however some form of auto formatting would help a11y for contributors not familiar with CLI tools.

Testing

to correctly mimic production environment (opening a PR from fork of a organization repo), i've created following PR: scarf-roguelike#4

which is my repo's BN (fork) -> my organization's BN (fork)

they seem to work properly, and thanks to @rtizzy, autofix.ci app is enabled on BN.

Additional context

commit made by <autofix.ci>:

commit history:

https://github.com/scarf-roguelike/Cataclysm-BN/pull/4/files/f7c5dba1f9e10fef1d3c95641257b8b57bca547d..4725cc5df751c8f34eb96eaf0fb37f66dec12214

[olanti-p]

I feel this needs a warning somewhere in the PR template or the contributor docs.
If the bot pushes a commit to the branch, and a contributor is fairly new to git, they may not know they'll need to pull the changes before pushing their own.

[scarf005]

added warning in PR template. I wanted the workflow to also attach comment on malformed PR too, but due to github actions security limitations, it might get a bit complicated.

autofix-ci/action#7

[olanti-p]

LGTM