fix: disable persist-credentials and use mirror remote

Author: dcabib

.github/workflows/sync-to-mirror-repo.yml

@@ -19,8 +19,9 @@ jobs:
           repository: aws/aws-sam-cli
           ref: develop
           fetch-depth: 0
+          persist-credentials: false
 
       - name: Push to mirror repo
         run: |
-          git remote set-url origin https://x-access-token:${{ secrets.SYNC_TOKEN }}@github.com/${{ github.repository }}.git
-          git push origin develop:develop --force
+          git remote add mirror https://x-access-token:${{ secrets.SYNC_TOKEN }}@github.com/${{ github.repository }}.git
+          git push mirror develop:develop --force