Summary of Practical Examples With Github-Actions

2 min readOct 11, 2021

What is GitHub Actions?

Easily automate all software workflows with world-class CI / CD. You can build, test, and deploy code directly from GitHub to get code review, branch management, and problem triage to work the way you want.

Practical examples

Environmental variables (Global)
Environmental variables (In step)
Multiple command simplification
Specify subfolder
Action trigger condition (Specified folder)
Action trigger condition (Other than the specified folder)
Execution order of multiple jobs
Workflow execution between repositories
Send notification to Slack

Environmental variables (Global)

on:
  push:
    branches:
      - mainenv:
  ACCESS_KEY_ID: ${{ secrets.ACCESS_KEY_ID }}
  SECRET_ACCESS_KEY: ${{ secrets.SECRET_ACCESS_KEY }}

Environmental variables (In step)

jobs:
  Build:
    runs-on: ubuntu-lateststeps:
      - name: install
        run: yarn install
        env:
          ENVIRONMENT: test

Multiple command simplification

jobs:
  Build:
    runs-on: ubuntu-lateststeps:
      - name: Install_And_Build
        run: |
          yarn install
          yarn build

Specify subfolder

jobs:
  Build:
    runs-on: ubuntu-lateststeps:
      - name: deploy
        working-directory: source
        run: |
          yarn deploy

Action trigger condition (Specified folder)

on:
  push:
    branches:
      - master
    paths:
      - source/**

Action trigger condition (Other than the specified folder)

on:
  push:
    branches:
      - master
    paths-ignore:
      - source/**

Execution order of multiple jobs

jobs:
  Build:
    runs-on: ubuntu-lateststeps:
      - run: TestDeploy:
    needs:
      - Build
    runs-on: ubuntu-lateststeps:
      - run: Test

Workflow execution between repositories → repository-dispatch(From)

jobs:
  Backend:
    runs-on: ubuntu-lateststeps:
      - name: Repository Dispatch
        uses: peter-evans/repository-dispatch@v1.1.0
        with:
          token: ${{ secrets.REPO_ACCESS_TOKEN }}
          repository: owner/repository
          event-type: next

Workflow execution between repositories → repository-dispatch(To)

on:
  repository_dispatch:
    types: next

Send notification to Slack

jobs:
  Slack:
    runs-on: ubuntu-lateststeps:
      - name: Slack Notify
        uses: rtCamp/action-slack-notify@v2.0.1
        env:
          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
          SLACK_CHANNEL: build
          SLACK_TITLE: Build Success
          SLACK_COLOR: '#43a047'
          SLACK_MESSAGE: ${{ github.repository }} Build Success
          SLACK_USERNAME: ${{ github.repository }}