GitHub Action push to repo.yml

jobs:
  build:    
    steps:
    - name: Configure git
      run: |
        git config --global committer.email "noreply@github.com"
        git config --global committer.name "GitHub"
        git config --global author.email "${GITHUB_ACTOR}@users.noreply.github.com"
        git config --global author.name "${GITHUB_ACTOR}"
    - name: Commit and push build dir
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      run: |
        credentials=$(echo -n "${GITHUB_ACTOR}:${GITHUB_TOKEN}" | base64)
        authheader="Authorization: Basic ${credentials}"
        remote="https://github.com/${GITHUB_REPOSITORY}.git"
        branch="gh-pages"
        pushd _site
        git init
        git add .
        git commit --message "Publishing website" --verbose
        git -c http.extraheader="${authheader}" --force push $remote master:$branch
        popd