Add auth for onboarding status page

[amrit110]

This pull request introduces comprehensive Google OAuth 2.0 authentication with domain restriction to the Onboarding Status Web dashboard. It adds server-side session management, new authentication API routes, and updates documentation and deployment configuration to support secure login for @vectorinstitute.ai users only. Environment variables and deployment workflows are updated to ensure proper integration and security.

Authentication System Implementation

• Added full Google OAuth 2.0 authentication flow with PKCE, domain restriction, and encrypted session management using iron-session. New API routes were created for login (/api/auth/login), callback (/api/auth/callback), logout (/api/auth/logout), and session info (/api/auth/session). Only @vectorinstitute.ai email addresses are allowed. [1] [2] [3] [4] [5] [6]

Documentation Updates

• Added detailed authentication documentation (onboarding-status-web-auth.md), updated the main README with setup, environment variables, and troubleshooting for authentication, and included the new doc in the navigation. [1] [2] [3] [4] [5] [6] [7]

Configuration and Environment Variables

• Introduced new required and optional environment variables for OAuth and session management in .env.example and documentation, including NEXT_PUBLIC_GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET, SESSION_SECRET, NEXT_PUBLIC_APP_URL, REDIRECT_URI, and ALLOWED_DOMAINS. [1] [2]

Deployment Workflow Enhancements

• Updated GitHub Actions workflow to inject new authentication-related environment variables into the test and deployment jobs, ensuring secrets are used securely in production. [1] [2]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.09%. Comparing base (72c64df) to head (b078737).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #39   +/-   ##
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  Coverage   88.09%   88.09%           
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  Files           3        3           
  Lines         462      462           
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  Hits          407      407           
  Misses         55       55           

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