build-and-deploy.yml

name: Build and Deploy

on:
  push: ~
  workflow_dispatch: ~

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest
    container: strongboxci/mkdocs:base
    env:
      # DEPLOY_URL=https://strongbox.github.io, but it's a "secrets" to allow easier changing if necesary without changing the code.
      DEPLOY_URL: "${{ secrets.DEPLOY_URL }}"
      GOOGLE_ANALYTICS_KEY: "${{ secrets.GOOGLE_ANALYTICS_KEY }}"
    steps:
      # Downloads a copy of the code in your repository before running CI tests
      - name: Check out repository code
        uses: actions/checkout@v2
        with:
          token: ${{ secrets.GH_TOKEN }} 
      - name: Get short SHA
        id: slug
        run: echo "::set-output name=short_sha::$(echo ${GITHUB_SHA} | cut -c1-7)"
      - name: Build
        run: mkdocs build
      - name: Setup upstream
        if: github.ref == 'refs/heads/master'
        run: |
          git config user.name "${{ secrets.GH_USER }}"
          git config user.email "${{ secrets.GH_EMAIL }}"
          git remote add strongbox.github.io "https://${{ secrets.GH_TOKEN }}@github.com/strongbox/strongbox.github.io"
          git fetch strongbox.github.io
      - name: Prepare built assets
        if: github.ref == 'refs/heads/master'
        run: |
          git checkout --orphan gh-pages
          find . -maxdepth 1 ! -name "site" ! -name ".git*" ! -name "." -exec git rm -rf {} \;
          git add --force site
          git commit -m "strongbox/strongbox-docs#${{ steps.slug.outputs.short_sha }}: ${{ github.event.head_commit.message }}"
          git log -n 1 --format=oneline
      - name: Deploy
        if: github.ref == 'refs/heads/master'
        run: | 
          git push strongbox.github.io `git subtree split --prefix site gh-pages`:master --force