feat: add GitHub OAuth authentication with Turso

[arnabnandy7]

Summary

Adds GitHub OAuth authentication using Better Auth, with users, linked accounts, and sessions persisted in Turso.

Changes

• Add Better Auth with GitHub as the OAuth provider
• Add Drizzle ORM and the Turso/libSQL database client
• Add the /api/auth/[...all] authentication route
• Add sign-in, account display, and sign-out controls
• Display authenticated users’ GitHub names and avatars
• Configure GitHub avatar images in Next.js
• Add Better Auth database schemas for:
  • Users
  • OAuth accounts
  • Sessions
  • Verification records
• Add a reproducible Turso migration
• Document the required environment variables in .env.example

Environment Variables

The following variables must be configured in Vercel:

• TURSO_DATABASE_URL
• TURSO_AUTH_TOKEN
• BETTER_AUTH_SECRET
• BETTER_AUTH_URL
• GITHUB_CLIENT_ID
• GITHUB_CLIENT_SECRET

For production:

BETTER_AUTH_URL=https://openissue-dev.vercel.app

GitHub OAuth callback URL:

https://openissue-dev.vercel.app/api/auth/callback/github

Database

The migration creates the following tables:

• user
• account
• session
• verification

The migration has already been applied to the current Turso database.

Validation

• TypeScript validation passed
• Authentication files passed ESLint
• 38 existing tests passed
• Production build passed
• Turso connection verified
• Remote authentication tables verified
• No credentials or secrets are included in tracked files

Testing Instructions

1. Configure the required environment variables.
2. Start the application.
3. Click Sign in with GitHub.
4. Authorize the OAuth application.
5. Confirm that the application returns to the homepage.
6. Confirm that the user’s GitHub name and avatar are displayed.
7. Confirm that user, account, and session records are created in Turso.
8. Click the sign-out button and confirm the session ends.

Closes #41

[vercel]

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Project	Deployment	Actions	Updated (UTC)
openissue-dev	Ready	Preview	Aug 20, 2026 2:15pm

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud