feat(ticket-5.4): self-hosting with Docker Compose

[vincentgrobler]

Description

• Add docker-compose.yml: 4 services (postgres, migrate, frontend, task-runner)
• Add Dockerfile: multi-stage frontend build (Vite → nginx:1.27-alpine)
• Update task-runner/Dockerfile: npm ci, health check
• Add docker/migrate.sh: auto-migration with _migrations tracking table
• Add docker/nginx.conf: SPA routing, gzip, asset caching, security headers
• Add .dockerignore: exclude node_modules, .git, dist
• Expand .env.example: all Docker Compose variables documented
• Add docs/self-hosting.md: full guide with architecture diagram, config reference, management commands, troubleshooting

Related Issue

None

Type of Change

• [ ✓ ] ✨ New feature (non-breaking change that adds functionality)

How Has This Been Tested?

Internal

• [ x ] Unit tests
• [ ✓ ] Manual testing
• [ x ] Browser testing (specify browsers)

Screenshots (if applicable)

None

Checklist

• [ ✓ ] My code follows the project's coding standards
• [ ✓ ] I have run npm run lint and there are no errors
• [ ✓ ] I have run npm run test and all tests pass
• [ ✓ ] I have added tests for my changes (if applicable)
• [ ✓ ] I have updated the documentation (if applicable)
• [ ✓ ] My source files have AGPL licence headers
• [ ✓ ] My changes generate no new TypeScript errors

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Project	Deployment	Actions	Updated (UTC)
crewform	Ready	Preview, Comment	Feb 25, 2026 3:55pm