checkstyle.yml

# This is a basic workflow to help you get started with Actions
name: Checkstyle for Java

# Controls when the action will run. 
on:
  # Triggers the workflow on push or pull request events but only for the master branch
  push:
    branches: [ master ]
  pull_request:
    branches: [ master ]

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  # This workflow contains a single job called "checkstyle"
  checkstyle_job:
    name: Checkstyle
    runs-on: ubuntu-latest
    steps:
    # Grab the newest version of repo
    - uses: actions/checkout@v2
    # Set JDK to 11
    - name: Set up JDK 11
      uses: actions/setup-java@v1
      with:
        java-version: 11
    # Building with MVN
    - name: Build with Maven
      run: mvn -B clean compile install package --file pom.xml
    # Calling checkstyle
    - name: Run CheckStyle
      uses: nikitasavinov/checkstyle-action@master
      with:
        github_token: ${{ secrets.github_token }}
        reporter: github-pr-review
        level: warning