fix(ci): add presence gate for FARM_DISPATCH_TOKEN in instant-sync

Author: hyperpolymath

.github/workflows/instant-sync.yml

@@ -14,6 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 15
     steps:
+    if: ${{ secrets.FARM_DISPATCH_TOKEN != '' }}
       - name: Trigger Propagation
         uses: peter-evans/repository-dispatch@28959ce8df70de7be546dd1250a005dd32156697 # v3
         with: