Set up PostgreSQL database configuration and enhance application structure

- Added .env.example with database connection details and JWT configuration.
- Introduced docker-compose.yml for PostgreSQL service setup with health checks.
- Created drizzle.config.ts for database schema and migration management.
- Updated nest-cli.json to include Swagger plugin configuration for API documentation.
- Enhanced package.json with new database-related scripts and dependencies.
- Implemented initial database migrations for user and token management.
- Configured application bootstrap process to load environment variables and set up Swagger.
- Added shared application configuration in configure-app.ts for consistent setup.
- Included unit tests for application configuration and Swagger setup.

docker-compose.yml

@@ -0,0 +1,19 @@
+services:
+  postgres:
+    image: postgres:16-alpine
+    ports:
+      - '5432:5432'
+    environment:
+      POSTGRES_USER: tracking
+      POSTGRES_PASSWORD: tracking
+      POSTGRES_DB: tracking
+    volumes:
+      - tracking_pg_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ['CMD-SHELL', 'pg_isready -U tracking -d tracking']
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+volumes:
+  tracking_pg_data: