fix: Re-add passphrase to on-push.yml.

(cherry picked from commit d3e4817)

Author: MerchantPug

.github/workflows/on-push.yml

@@ -13,5 +13,6 @@ jobs:
         with:
           host: ${{ secrets.HOST }}
           username: ${{ secrets.USERNAME }}
+          passphrase: ${{ secrets.PASSPHRASE }}
           key: ${{ secrets.SSH_KEY }}
           script: sh ./update_backend.sh