How does this website work?

name: Publish

on:
  push:
    branches:
      - main

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout source
        uses: actions/checkout@v6
        with:
          path: jake-wright-net-src

      - name: Checkout destination
        uses: actions/checkout@v6
        with:
          repository: jakewright/jake-wright-net
          token: ${{ secrets.GH_PAT }}
          path: jake-wright-net

      - name: Setup Hugo
        uses: peaceiris/actions-hugo@v3
        with:
          hugo-version: 'latest'
          extended: true

      - name: Build
        run: |
          # Delete everything except the .git directory
          find jake-wright-net -mindepth 1 -maxdepth 1 ! -name ".git" -exec rm -rf {} +

          # Copy all source files
          cp -a jake-wright-net-src/src/. jake-wright-net/

          # Build the site. This must be done in the destination directory so
          # that hugo uses the correct git repository.
          hugo -s jake-wright-net

      - name: Push changes
        run: |
          cd jake-wright-net
          git config user.name "Jake Wright"
          git config user.email "5333300+jakewright@users.noreply.github.com"

          # If there are any changes according to git
          if [[ -n $(git status -s) ]]; then
            # Use the commit message from the jake-wright-net-src
            COMMIT_MESSAGE=$(git -C ../jake-wright-net-src log -1 --pretty=%s)
            git add .
            git commit -m "$COMMIT_MESSAGE"
            git push
          else
            echo "No changes to commit"
          fi