add ocamlformat github action

[hannesm]

expectation for this PR is to fail (since the code isn't ocamlformat-formatted).

//cc @PizieDust

[hannesm]

So, this is my proposal. A GitHub action that potentially adds a commit with the autoformatted code. What do you think?

[PizieDust]

So, this is my proposal. A GitHub action that potentially adds a commit with the autoformatted code. What do you think?

This will be amazing. Is the pipeline costly to run? If so, we can always just try to remember to run ocamlformat before pushing, else this is a really awesome idea to have the CI format and add a commit.

Will this run for each commit? Can we have it run only when we are merging something into the main branch?

[hannesm]

It took 3 minutes. I think if you've your editor with ocamlformat, that's fine. But if not, don't worry, and the CI will take care of it.

[PizieDust]

It took 3 minutes. I think if you've your editor with ocamlformat, that's fine. But if not, don't worry, and the CI will take care of it.

Okay great. I do have ocamlformat. I guess I just have to run ocamlformat --inplace before pushing