Add update playlist for unattended playlist update

.github/workflows/update_playlis.yml

@@ -0,0 +1,20 @@
+name: Update playlist
+
+on:
+  push:
+    branches: [ automate-1 ]
+  workflow_dispatch:
+
+jobs:
+  update-plalist:
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Update playlist
+        run: |
+          git config user.name "PlaylistBot"
+          git config user.email "playlistbot@users.noreply.github.com"
+          git add .
+          git commit --quiet -m "Update Playlist (GitHub Actions)"
+          git push -f origin automate-1