Phase 9: Docker Deployment Setup - docker-compose with logging and port mapping

- Updated docker-compose.yml with port 8990:8000 mapping
- Fixed environment variables to match current .env configuration
- Added third PostgreSQL database (postgres_mirror) for mirror/sync data
- Added robust JSON file logging for all containers (10MB max, 3 files)
- Updated PostgreSQL credentials to use postgres/postgres
- Added health checks for all services
- Enhanced Dockerfile with logging environment variables
- Created .env.docker documentation file with deployment checklist
- Docker build verified successfully

backend/Dockerfile

@@ -45,9 +45,17 @@ RUN chmod +x /app/scripts/*.py
 COPY --chown=appuser:appuser .env.example ./.env.example
 COPY --chown=appuser:appuser pyproject.toml ./
 
-ENV PYTHONPATH=/app
+# Python environment variables for proper logging
 ENV PYTHONUNBUFFERED=1
 ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONPATH=/app
+
+# Logging configuration
+ENV MTG_LOG_LEVEL=INFO
+ENV MTG_LOG_FORMAT=json
+
+# Create logging directory with proper permissions
+RUN mkdir -p /app/logs && chown appuser:appuser /app/logs
 
 HEALTHCHECK --interval=30s --timeout=20s --start-period=5s --retries=3 \
     CMD curl -f http://localhost:8000/health || exit 1