Update wiki pages with Table of Contents (using tocer gem) automatically when the wiki changes

wiki_toc.yml

# .github/workflows/wiki_toc.yml

name: Update wiki table of contents

on:
  - gollum

jobs:
  run:
    runs-on: ubuntu-latest
    container:
      image: ruby:2.6.6
    steps:
      - uses: actions/checkout@v2
        with:
          repository: ${{github.repository}}.wiki
      - name: Update Wiki TOC
        run: |
          gem install tocer -v '~>9.1'
          tocer -g
      - name: Commit changes
        run: |
          git config --local user.email "action@github.com"
          git config --local user.name "GitHub Action"
          git add .
          git commit -m "Updated TOC"
      - name: Push changes
        uses: ad-m/github-push-action@master
        with:
          repository: ${{github.repository}}.wiki
          github_token: ${{ secrets.GITHUB_TOKEN }}