Add CI bot configuration for pre-commit

[dokempf]

This is a new feature of pre-commit that will allow us to enforce e.g. code formatting etc.

[lkeegan]

https://pre-commit.ci/ is one-click setup and works great - except that I found that clang-format didn't work.
This ci job basically does the same thing: https://github.com/ssciwr/hammingdist/blob/master/.github/workflows/ci.yml#L47

[dokempf]

I guess the clang-format issue is because the clang-format pip package is not available on all platforms and therefore the hook does not specify the dependency on clang-format in https://github.com/pocc/pre-commit-hooks/blob/master/.pre-commit-hooks.yaml#L11 Luckily, this will be fixed when the packaging issue in ssciwr/clang-format-wheel#4 is fully resolved.

[lkeegan]

very nice! I look forward to deleting my format ci job once this is available :-)
I came across this repo a while ago which might be a helpful reference in terms of building older versions on the various platforms: https://github.com/muttleyxd/clang-tools-static-binaries

[dokempf]

Pre-commit CI is enabled and working.