Add secret with rights for github action bot

Author: MisterJack49

.github/workflows/update.yml

@@ -30,9 +30,11 @@ jobs:
           mv index.xml docs/index.xml
       
       - name: Commit RSS update
+        env:
+          GH_PAT: ${{ secrets.GH_PAT }}
         run: |
           git config user.name "github-actions"
           git config user.email "github-actions@github.com"
           git add docs/index.xml
           git diff --cached --quiet || git commit -m "Update RSS feed"
-          git push
+          git push https://x-access-token:${GH_PAT}@github.com/${{ github.repository }}.git HEAD:master