Allow PRODUCTION=1 pod install

Mentioned in
- reactwg/react-native-releases#21 (reply in thread)
  - #33882

Close: #33764

template/ios/Podfile

@@ -4,6 +4,8 @@ require_relative '../node_modules/react-native/scripts/native_modules'
 platform :ios, '12.4'
 install! 'cocoapods', :deterministic_uuids => false
 
+production = ENV["PRODUCTION"] == "1"
+
 target 'HelloWorld' do
   config = use_native_modules!
 
@@ -12,6 +14,7 @@ target 'HelloWorld' do
 
   use_react_native!(
     :path => config[:reactNativePath],
+    :production => production,
     # Hermes is now enabled by default. Disable by setting this flag to false.
     # Upcoming versions of React Native may rely on get_default_flags(), but
     # we make it explicit here to aid in the React Native upgrade process.