build: update content-update branch on push to main

.forgejo/workflows/build-docker-image.yaml

@@ -44,3 +44,22 @@ jobs:
           ssh_key: '${{ secrets.DOCKER_SWARM_SSH_KEY }}'
           file: 'docker-stack.yaml'
           name: 'personal-page'
+
+  rebase:
+    runs-on: ubuntu-latest
+    needs: deploy
+    if: success()
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: '0'
+          ref: content-update
+
+      - name: Update branch
+        run: |
+          set -x
+          git config --global user.name "robo"
+          git config --global user.email "robo@alecodes.page"
+          git rebase origin/main
+          git push origin content-update --force-with-lease