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docs/BUILD_GUIDE.md

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+# Build Guide
+
+This guide covers building the open-source version of Gitea Mirror.
+
+## Prerequisites
+
+- **Bun** >= 1.2.9 (primary runtime)
+- **Node.js** >= 20 (for compatibility)
+- **Git**
+
+## Quick Start
+
+```bash
+# Clone repository
+git clone https://github.com/yourusername/gitea-mirror.git
+cd gitea-mirror
+
+# Install dependencies
+bun install
+
+# Initialize database
+bun run init-db
+
+# Build for production
+bun run build
+
+# Start the application
+bun run start
+```
+
+## Build Commands
+
+| Command | Description |
+|---------|-------------|
+| `bun run build` | Production build |
+| `bun run dev` | Development server |
+| `bun run preview` | Preview production build |
+| `bun test` | Run tests |
+| `bun run cleanup-db` | Remove database files |
+
+## Build Output
+
+The build creates:
+- `dist/` - Production-ready server files
+- `.astro/` - Build cache (git-ignored)
+- `data/` - SQLite database location
+
+## Development Build
+
+For active development with hot reload:
+
+```bash
+bun run dev
+```
+
+Access the application at http://localhost:4321
+
+## Production Build
+
+```bash
+# Build
+bun run build
+
+# Test the build
+bun run preview
+
+# Run in production
+bun run start
+```
+
+## Docker Build
+
+```dockerfile
+# Build Docker image
+docker build -t gitea-mirror:latest .
+
+# Run container
+docker run -p 3000:3000 gitea-mirror:latest
+```
+
+## Environment Variables
+
+Create a `.env` file:
+
+```env
+# Database
+DATABASE_PATH=./data/gitea-mirror.db
+
+# Authentication
+JWT_SECRET=your-secret-here
+
+# GitHub Configuration
+GITHUB_TOKEN=ghp_...
+GITHUB_WEBHOOK_SECRET=...
+
+# Gitea Configuration
+GITEA_URL=https://your-gitea.com
+GITEA_TOKEN=...
+```
+
+## Common Build Issues
+
+### Missing Dependencies
+
+```bash
+# Solution
+bun install
+```
+
+### Database Not Initialized
+
+```bash
+# Solution
+bun run init-db
+```
+
+### Port Already in Use
+
+```bash
+# Change port
+PORT=3001 bun run dev
+```
+
+### Build Cache Issues
+
+```bash
+# Clear cache
+rm -rf .astro/ dist/
+bun run build
+```
+
+## Build Optimization
+
+### Development Speed
+
+- Use `bun run dev` for hot reload
+- Skip type checking during rapid development
+- Keep `.astro/` cache between builds
+
+### Production Optimization
+
+- Minification enabled automatically
+- Tree shaking removes unused code
+- Image optimization with Sharp
+
+## Validation
+
+After building, verify:
+
+```bash
+# Check build output
+ls -la dist/
+
+# Test server starts
+bun run start
+
+# Check health endpoint
+curl http://localhost:3000/api/health
+```
+
+## CI/CD Build
+
+Example GitHub Actions workflow:
+
+```yaml
+name: Build and Test
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: oven-sh/setup-bun@v2
+      - run: bun install
+      - run: bun run build
+      - run: bun test
+```
+
+## Troubleshooting
+
+### Build Fails
+
+1. Check Bun version: `bun --version`
+2. Clear dependencies: `rm -rf node_modules && bun install`
+3. Check for syntax errors: `bunx tsc --noEmit`
+
+### Runtime Errors
+
+1. Check environment variables
+2. Verify database exists
+3. Check file permissions
+
+## Performance
+
+Expected build times:
+- Clean build: ~5-10 seconds
+- Incremental build: ~2-5 seconds
+- Development startup: ~1-2 seconds
+
+## Next Steps
+
+- Configure with [Configuration Guide](./CONFIGURATION.md)
+- Deploy with [Deployment Guide](./DEPLOYMENT.md)
+- Set up authentication with [SSO Guide](./SSO-OIDC-SETUP.md)