add IOS_FIREBASE_KEY secret to env

Author: mcginty

.github/workflows/mobile-deploy-ios.yml

@@ -74,6 +74,7 @@ jobs:
         env:
           IOS_PROFILE_KEY: ${{ secrets.IOS_PROFILE_KEY }}
           IOS_CERTIFICATE_KEY: ${{ secrets.IOS_CERTIFICATE_KEY }}
+          IOS_FIREBASE_KEY: ${{ secrets.IOS_FIREBASE_KEY }}
 
       - name: Build
         run: |