chore: auto-refresh demo gif

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Rohan5commit

.github/workflows/generate-demo.yml

@@ -3,12 +3,17 @@ name: Generate Demo GIF
 on:
   workflow_dispatch:
 
+permissions:
+  contents: write
+
 jobs:
   demo:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
 
       - name: Setup Python
         uses: actions/setup-python@v5
@@ -24,8 +29,20 @@ jobs:
         run: |
           docker run --rm -v "$PWD":/vhs ghcr.io/charmbracelet/vhs .github/demo.tape
 
+      - name: Commit refreshed demo.gif
+        run: |
+          if git diff --quiet -- demo.gif; then
+            echo "demo.gif unchanged"
+            exit 0
+          fi
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add demo.gif
+          git commit -m "chore: refresh demo gif" -m "Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>"
+          git push
+
       - name: Upload demo artifact
         uses: actions/upload-artifact@v4
         with:
           name: demo-gif
-          path: demo.gif
+          path: demo.gif