feat: implements config loader to enable remote or external configs

[dcoric]

This pull request introduces a significant update to the configuration management system of the GitProxy application. The main changes include adding support for multiple configuration sources, implementing a new configuration loader class, and providing the ability to reload configurations without restarting the application.

Configuration Management Enhancements:

• Added support for multiple configuration sources in config.schema.json and proxy.config.json, allowing the configuration to be sourced from files, HTTP endpoints, or Git repositories. [1] [2]

• Introduced a new ConfigLoader class in src/config/ConfigLoader.js to manage the loading and reloading of configurations from the specified sources. This class handles periodic reloading, merging configurations, and emitting events on configuration changes.

CLI and API Improvements:

• Added a new CLI command reload-config in packages/git-proxy-cli/index.js to trigger a configuration reload without restarting the process. This command checks for authentication and makes a POST request to the admin API endpoint to reload the configuration. [1] [2]

• Added a new admin-only API endpoint /api/v1/admin/reload-config in src/service/index.js to handle configuration reload requests. This endpoint validates the request, reloads the configuration, and restarts the services if necessary.

Proxy Service Enhancements:

• Updated the proxy service in src/proxy/index.js to support stopping and restarting the HTTP and HTTPS servers, enabling the application to apply new configurations without a full restart.

Configuration Access and Updates:

• Refactored src/config/index.js to use the new ConfigLoader and updated existing getter functions to retrieve values from the current configuration. Added functionality to handle configuration updates dynamically and restart services as needed. [1] [2] [3]fix: config loader clone command issue

This PR fixes #934

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: dcoric / name: Denis Ćorić (55ce8ee, f0a05be, 7f0a5cf, af724ee, e98c90b)

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[dcoric]

I will rebase to the latest main branch, check the failing test, and post an update afterward.

[06kellyjac]

Some suggestions and questions

[codecov]

Codecov Report

Attention: Patch coverage is 47.91667% with 100 lines in your changes missing coverage. Please review.

Project coverage is 58.91%. Comparing base (38041ff) to head (7dea019).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/config/ConfigLoader.js	51.51%	48 Missing ⚠️
src/proxy/index.js	16.66%	20 Missing ⚠️
src/config/index.js	65.38%	18 Missing ⚠️
src/service/index.js	17.64%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #935      +/-   ##
==========================================
- Coverage   61.88%   58.91%   -2.97%     
==========================================
  Files          49       51       +2     
  Lines        1805     1952     +147     
==========================================
+ Hits         1117     1150      +33     
- Misses        688      802     +114     

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[JamieSlome]

@dcoric - can we bolster up the code coverage? 🚀

[dcoric]

@dcoric - can we bolster up the code coverage? 🚀

Done.
This helped to identify (and fix) some potential issues with validation functions 👏