[ci] Update wiki via this repository (#16446)

Authored by: bashonly

.github/workflows/wiki.yml

@@ -0,0 +1,32 @@
+name: Update wiki
+on:
+  schedule:
+    - cron: '22 22 * * *'
+  workflow_dispatch:
+
+permissions: {}
+
+concurrency:
+  group: wiki
+  cancel-in-progress: true
+
+jobs:
+  update_wiki:
+    name: Update wiki
+    if: github.ref == 'refs/heads/master' && github.repository == 'yt-dlp/yt-dlp'
+    permissions:
+      contents: write  # Needed to git-push to the wiki
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          repository: yt-dlp/yt-dlp-wiki
+          ref: master
+          fetch-depth: 0
+          persist-credentials: true  # Needed to git-push to the wiki
+
+      - name: Push to wiki
+        run: |
+          git remote add upstream git@github.com:yt-dlp/yt-dlp.wiki
+          git fetch upstream
+          git push --force upstream master