Add Docker and PostgreSQL local development setup

[Orlando-Alvarez]

Summary

This pull request adds Docker-based local development support for Ticket-API.

Changes

• Added a Dockerfile for the FastAPI application.
• Added docker-compose.yml with two services:
  • api for the FastAPI backend.
  • db for the PostgreSQL database.
• Added .dockerignore to keep local development files out of the Docker image.
• Updated .env.example with PostgreSQL-related environment variables.
• Updated README.md with Docker usage instructions.

Validation

• Confirmed the API starts successfully with Docker Compose.
• Confirmed the health endpoint responds successfully:

GET /api/v1/health

• Confirmed the API returns:

{
  "status": "ok",
  "service": "ticket-api",
  "version": "0.1.0"
}

• Confirmed existing tests continue to pass with:

python -m pytest

• Confirmed GitHub Actions CI passes successfully.

Notes

• This PR does not add Alembic yet.
• This PR does not add database migrations yet.
• This PR does not add CRUD endpoints yet.
• This PR does not add authentication yet.
• This PR does not add cloud deployment configuration yet.