Set application port from environment (safe-global#223)

- Sets the application port from the local environment (value set by `APPLICATION_PORT`)
- If `APPLICATION_PORT` is not set, the default port `3000` will be used (default)

src/config/entities/configuration.ts

@@ -4,6 +4,7 @@ export default () => ({
     version: process.env.npm_package_version || '',
     buildNumber: process.env.GITHUB_RUN_NUMBER || '',
   },
+  applicationPort: process.env.APPLICATION_PORT || '3000',
   exchange: {
     baseUri:
       process.env.EXCHANGE_API_BASE_URI || 'http://api.exchangeratesapi.io/v1',

src/main.ts

@@ -3,6 +3,7 @@ import { NestFactory } from '@nestjs/core';
 import { AppModule } from './app.module';
 import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
 import { DataSourceErrorFilter } from './routes/common/filters/data-source-error.filter';
+import { IConfigurationService } from './config/configuration.service.interface';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
@@ -23,7 +24,12 @@ async function bootstrap() {
   const document = SwaggerModule.createDocument(app, config);
   SwaggerModule.setup('', app, document);
 
-  await app.listen(3000);
+  const configurationService: IConfigurationService =
+    app.get<IConfigurationService>(IConfigurationService);
+  const applicationPort: string =
+    configurationService.getOrThrow('applicationPort');
+
+  await app.listen(applicationPort);
 }
 
 bootstrap();