chore: updated push pipeline to fetch fastlane data from fastlane branch (#2504)

Author: AsCress

.github/workflows/push-event.yml

@@ -149,6 +149,7 @@ jobs:
       - name: Update app in Open Testing track
         if: ${{ github.repository == 'fossasia/pslab-android' }}
         run: |
+          git clone --branch=fastlane https://${{ github.repository_owner }}:${{ github.token }}@github.com/${{ github.repository }} fastlane
           bundle exec fastlane uploadToOpenTesting
           if [[ $? -ne 0 ]]; then
               exit 1