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build_image:
  image: docker:git
  services:
  - docker:dind
  script:
    # Login to Gitlab Registry
    - docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN registry.gitlab.com
    # Build image
    - docker build -t registry.gitlab.com/<username>/<repo-name>/<docker-name>:latest --build-arg env=sandbox --build-arg <SOME-ARG>=<VALUE> .  
    # Then push image

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namespace Demo.WebApi.Controllers
{
    // SIMPLE AUTHORIZATION
    [Authorize]
    [Route("api/[controller]")]
    public class AccountController : Controller
    {
        public AccountController()
        {
        }

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version: '2'
services:
  sandbox.web:
    build:
      context: .
      args:
        env: sandbox
    ports:
      - "8080:80"
  app.web:

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worker_processes  1;

events {
    worker_connections  1024;
}

http {
    server {
        listen 80;
        server_name  localhost;

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{
  // ...
  "scripts": {
    "ng": "ng",
    "start": "ng serve & gulp watch",
    "serve": "ng serve --sourcemap=false --verbose",
    "build:prod": "ng build --env=prod --prod --build-optimizer",
    "build:sandbox": "ng build --env=sandbox ---prod --build-optimizer",
  },
  // ...

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# The builder from node image
FROM node:alpine as builder

# build-time variables 
# prod|sandbox its value will be come from outside 
ARG env=prod

RUN apk update && apk add --no-cache make git

# Move our files into directory name "app"

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export const environment = {
  production: true,
  config: {
    host: 'https://api.xxx.xxx/api'
    // more config
  }
};

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version: '3'

services:
  staging.api:
    build: .
    ports:
      - "5000:80"
    environment: 
      - ASPNETCORE_ENVIRONMENT=Staging
  production.api:

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FROM microsoft/aspnetcore-build:2.0 AS build-env
WORKDIR /app

# Copy csproj and restore as distinct layers
COPY *.csproj ./
RUN dotnet restore

# Copy everything else and build
COPY . ./
RUN dotnet publish -c Release -o out

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public partial class Startup
{
        public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: false, reloadOnChange: true)
                .AddEnvironmentVariables();
            Configuration = builder.Build();
        }