Warn on "pod install" with the new architecture disabled (#300)

Author: kraenhansen

.changeset/wicked-tables-deny.md

@@ -0,0 +1,5 @@
+---
+"react-native-node-api": patch
+---
+
+Warn on "pod install" with the new architecture disabled

packages/host/react-native-node-api.podspec

@@ -17,6 +17,10 @@ unless defined?(@xcframeworks_copied)
   @xcframeworks_copied = true
 end
 
+if ENV['RCT_NEW_ARCH_ENABLED'] == '0'
+  Pod::UI.warn "React Native Node-API doesn't support the legacy architecture (but RCT_NEW_ARCH_ENABLED == '0')"
+end
+
 Pod::Spec.new do |s|
   s.name         = package["name"]
   s.version      = package["version"]