Generalize the env vars handling

[amrit110]

This pull request introduces significant improvements to the onboarding CLI tool, focusing on making environment file generation and validation dynamic and template-driven. The changes ensure that the .env file is created and validated based on a provided .env.example template, improving flexibility and reducing hardcoded configuration. The CLI now requires the user to specify the .env.example path, and all relevant logic and tests have been updated accordingly.

Key changes include:

Environment file generation and validation

• The .env file is now generated by reading the provided .env.example template, preserving its order, comments, and structure, and filling in values from team and global configuration data. This replaces the previous hardcoded section-based approach. [1] [2]
• Validation of the .env file is now performed against the keys defined in the .env.example template, instead of a hardcoded list, making the process adaptable to different bootcamps or configurations. [1] [2]

CLI interface and argument handling

• The CLI now requires a new --env-example argument specifying the path to the .env.example template. Argument validation has been updated to enforce this requirement, and related logic ensures the template is used throughout onboarding. [1] [2] [3] [4] [5] [6] [7]

Firestore/global configuration

• The retrieval of global keys from Firestore is now parameterized by bootcamp_name, allowing for bootcamp-specific global configuration documents rather than a single shared one. [1] [2] [3] [4]

Testing updates

• Tests have been updated to create and use .env.example files, and to pass the new --env-example argument, ensuring that test coverage matches the new dynamic environment file logic. [1] [2] [3] [4]

Miscellaneous

• The project version has been bumped from 0.5.4 to 0.6.0 to reflect these breaking and feature changes.

[codecov]

Codecov Report

❌ Patch coverage is 95.45455% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.61%. Comparing base (f1d136a) to head (e6b527f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aieng_platform_onboard/utils.py	93.54%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
+ Coverage   89.87%   90.61%   +0.74%     
==========================================
  Files          10       10              
  Lines        1442     1407      -35     
==========================================
- Hits         1296     1275      -21     
+ Misses        146      132      -14     

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