feat(config): allow overriding config from environment

[noirbizarre]

Hello 👋🏼

First I apologize because I read the CONTRIBUTING.md after doing my PR so there is no open issue and no discussion for this. But any critism or refusal is welcome here 🙏🏼 (better late then never).

This PR allows to override some settings (all but dependency_mapping) using SYNC_PRE_COMMIT_LOCK_* environment variables.

There are multiple use case for this, but in my case I currently have 2:

• Explicitly disabling on project I contribute on but without being maintainer (meaning that I don't want to touch anything except my contribution, even if the pre-commit setting is not in sync)
• testing pre-commit configs (in my case, snapshot testing some copier templates, I want to be able to disable it during the test)

Note: I plan on doing another contribution real soon, but I promise I'll open an issue before to discuss this

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (45a5eb7) 94.23% compared to head (af01f65) 94.49%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #10      +/-   ##
==========================================
+ Coverage   94.23%   94.49%   +0.25%     
==========================================
  Files           9        9              
  Lines         434      454      +20     
  Branches       74       79       +5     
==========================================
+ Hits          409      429      +20     
  Misses         21       21              
  Partials        4        4              

Flag	Coverage Δ
unittests	94.49% <100.00%> (+0.25%)	⬆️

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[GabDug]

Quick review, with some typos and comment on the env var cast.

[GabDug]

Hey!
Don't worry, it's not an issue to not have discussed it before -- the goal is more to avoid working on out-of-scope MRs or duplicated effort: the contributing guide may be clearer.

This is a very welcomed improvement, thanks!

[noirbizarre]

There it is, PR updated.

On the contributing guide, this is always hard to find the right balance between being open enough for people to easily contribute and strict enough for this to be sustainable. I contribute a lot, try to follow them but I still encounter some issues sometimes so I am careful because I can understand the pressure of receiving a not welcome PR 😅

[GabDug]

Thanks for the PR, sorry for the delay :)