feat: integrate gitleaks

[06kellyjac]

integrate support for gitleaks checks (default off for now)
Users must make the gitleaks binary available on the PATH for git-proxy and enable via the git-proxy settings

[netlify]

✅ Deploy Preview for endearing-brigadeiros-63f9d0 canceled.

Name	Link
🔨 Latest commit	8a08115
🔍 Latest deploy log	https://app.netlify.com/projects/endearing-brigadeiros-63f9d0/deploys/682b32532a06c90008713d95

[codecov]

Codecov Report

Attention: Patch coverage is 16.48352% with 76 lines in your changes missing coverage. Please review.

Project coverage is 48.09%. Comparing base (a059202) to head (8a08115).
Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
src/proxy/processors/push-action/gitleaks.ts	11.62%	76 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1010      +/-   ##
==========================================
- Coverage   49.82%   48.09%   -1.73%     
==========================================
  Files          48       49       +1     
  Lines        1724     1813      +89     
  Branches      176      196      +20     
==========================================
+ Hits          859      872      +13     
- Misses        841      917      +76     
  Partials       24       24              

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[JamieSlome]

LGTM! 🍰