fix(ci): Update common_cocoapods_cron.yml (#15334)

Author: ncooke3

.github/workflows/common_cocoapods_cron.yml

@@ -46,6 +46,9 @@ on:
         required: false
         default: "macos-15"
 
+env:
+  FIREBASE_CI: true
+
 jobs:
   cron-job:
     if: |