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.

src/app.module.ts

@@ -1,9 +1,22 @@
 import { Module } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
 import { AppController } from './app.controller';
 import { AppService } from './app.service';
+import loadEnv from './config/env';
+import { DatabaseModule } from './database/database.module';
+import { AuthModule } from './modules/auth/auth.module';
+import { UsersModule } from './modules/users/users.module';
 
 @Module({
-  imports: [],
+  imports: [
+    ConfigModule.forRoot({
+      isGlobal: true,
+      load: [loadEnv],
+    }),
+    DatabaseModule,
+    UsersModule,
+    AuthModule,
+  ],
   controllers: [AppController],
   providers: [AppService],
 })