How to add SonarQube to a repository

1. make sure the repo is public

2. create sonar-project.properties

3. add sonar.projectKey=[REPO_NAME] to sonar-project.properties

4. create .github/workflows/sonarqube-build.yml

5. add

name: SonarQube Build
on:
  push:
    branches:
      - main # or the name of your main branch
jobs:
  build:
    name: Build
    runs-on: self-hosted
    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0
      - uses: sonarsource/sonarqube-scan-action@master
        env:
          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
          SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
      # If you wish to fail your job when the Quality Gate is red, uncomment the
      # following lines. This would typically be used to fail a deployment.
      # - uses: sonarsource/sonarqube-quality-gate-action@master
      #   timeout-minutes: 5
      #   env:
      #     SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

to .github/workflows/sonarqube-build.yml