fix(demos): restore HTTPS remote before git push

chezmoi apply deploys ~/.gitconfig which overwrites the GITHUB_TOKEN
credential setup from actions/checkout, causing git push to fail with
"Permission denied (publickey)". Explicitly set HTTPS remote URL with
the workflow token before pushing.

Author: Jacke

.github/workflows/demos.yml

@@ -101,6 +101,8 @@ jobs:
 
       - name: Commit and push GIFs
         run: |
+          # Restore HTTPS remote (chezmoi apply may overwrite ~/.gitconfig)
+          git remote set-url origin "https://x-access-token:${{ github.token }}@github.com/${{ github.repository }}.git"
           git config --local user.email "github-actions[bot]@users.noreply.github.com"
           git config --local user.name "github-actions[bot]"
           git add demos/gifs/*.gif