Serverless Frameworkで運用しているAWSアプリケーションのデプロイをGithub Actionで管理する方法

npm install -g serverless

serverless create --template aws-nodejs --name greeting-service --path greeting-service

prod:
  appName: "Serverless App"
default:
  appName: "DEV Serverless APP"

service: greeting-service
frameworkVersion: '2'

//自身で定義した変数 => serviceless.ymlで参照
custom:
  defaultStage: dev
  // 開発環境へのデプロイ　→　prod.appName変数が参照される。
  // 本番環境へのデプロイ　→　default.appName変数が参照される。
  environment: ${file(env.yml):${self:provider.stage}, file(env.yml):default}

provider:
  name: aws
  runtime: nodejs12.x
  lambdaHashingVersion: 20201221
  stage: ${opt:stage, self:custom.defaultStage}
  // lambdaで使用する変数
  environment:
    appName: ${self:custom.environment.appName}
  // 地域の指定
  region: ap-northeast-1

functions:
  greeting:
    handler: handler.greeting
    events:
      - http:
          path: /
          method: get

'use strict';

module.exports.greeting = async (event) => {
  console.log(process.env.appName);
  console.log(event.requestContext.stage);

  let html = `
    <p>Hi!</p>
  `;

  return {
    statusCode: 200,
    headers: {
      'Content-Type':'text/html'
    },
    body: html
  };
};

name: Deploy Dev Lambda Function by Serverless Framework
on:
  push:
    branches:
      - master
jobs:
  deploy-dev:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v1
    - uses: actions/setup-node@v1
      with:
        node-version: '12.x'
    - name: Install Serverless Framework
      run: npm install -g serverless
    - name: Serverless AWS authentication
      run: sls config credentials --provider aws --key ${{ secrets.AWS_KEY }} --secret ${{ secrets.AWS_SECRET }}
    - name: Create env file
      run: |
        cat > env.yml << EOF
        ${{ secrets.ENV }}
        EOF
    - name: Install NPM dependencies
      run: npm install
    - name: Deploy Lambda functions
      // ステージを開発環境に指定し、デプロイ
      run: sls deploy -s dev

name: Deploy Production Lambda Function by Serverless Framework
on:
  push:
    tags: # Deploy tag (e.g. v1.0) to production
      - 'v**'
jobs:
  deploy-prod:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v1
    - uses: actions/setup-node@v1
      with:
        node-version: '12.x'
    - name: Install Serverless Framework
      run: npm install -g serverless
    - name: Serverless AWS authentication
      run: sls config credentials --provider aws --key ${{ secrets.AWS_KEY }} --secret ${{ secrets.AWS_SECRET }}
    - name: Create env file
      run: |
        cat > env.yml << EOF
        ${{ secrets.ENV }}
        EOF
    - name: Install NPM dependencies
      run: npm install
     // ステージを本番環境に指定し、デプロイ
    - name: Deploy Lambda functions
      run: sls deploy -s prod

git push origin master

curl https://＊＊＊.execute-api.＊＊＊.amazonaws.com/dev/
<p>Hi!</p>

'use strict';
module.exports.greeting = async (event) => {
  console.log(process.env.appName);
  console.log(event.requestContext.stage);

  let html = `
    <p>Chao!</p>
  `;

  return {
    statusCode: 200,
    headers: {
      'Content-Type':'text/html'
    },
    body: html
  };
};

git push origin　Tag<version>

curl https://＊＊＊.execute-api.＊＊＊.amazonaws.com/prod/
<p>Chao!</p>