ci(github): deploy to branch instead of artifacts

.github/workflows/deploy.yml

@@ -29,35 +29,39 @@ jobs:
   # Build job
   build:
     runs-on: ubuntu-latest
+    env:
+      DEPLOY_DIR: _site/
+      DEPLOY_BRANCH: gh-pages
     steps:
       - name: Checkout
         uses: actions/checkout@v3
         with:
           submodules: recursive
-      - name: Setup Pages
-        id: pages
-        uses: actions/configure-pages@v3
+
+      - name: Prepare deployment branch
+        run: |
+          mkdir "${DEPLOY_DIR}"
+          cd "${DEPLOY_DIR}"
+          # Clone and checkout existing branch, or initialise with a new and empty branch
+          git clone --depth 5 --branch "${DEPLOY_BRANCH}" "https://github.com/${GITHUB_REPOSITORY}.git" . || git init -b "${DEPLOY_BRANCH}"
+
       - name: Install Node.js dependencies
         run: npm ci
+
       - name: Build with Eleventy
         env:
           NODE_ENV: production
           NODE_OPTIONS: '--max_old_space_size=4096'
-        run: npm run build -- --pathprefix="${{ steps.pages.outputs.base_path }}/"
-        # run: npm run build -- --pathprefix="/bugs.jquery.com/"
-      - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
-        with:
-          path: ./_site
+        run: npm run build -- --pathprefix="/bugs.jquery.com/"
 
-  # Deployment job
-  deploy:
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
-    runs-on: ubuntu-latest
-    needs: build
-    steps:
-      - name: Deploy to GitHub Pages
-        id: deployment
-        uses: actions/deploy-pages@v2
+      - name: Push to branch
+        # Inspired by https://github.com/helaili/jekyll-action/blob/2.2.0/entrypoint.sh
+        env:
+          GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
+        run: |
+          cd "${DEPLOY_DIR}"
+          git config user.name "${GITHUB_ACTOR}" && \
+          git config user.email "${GITHUB_ACTOR}@users.noreply.github.com" && \
+          git add . && \
+          git commit --allow-empty -m "Build commit ${GITHUB_SHA}" && \
+          git push "https://${GITHUB_ACTOR}:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git" "HEAD:${DEPLOY_BRANCH}"