Fix rive_native setup script path in Podfile

Ensures the rive_native setup script runs from the project root by updating its shell script phase in the Podfile. This change helps CI environments locate pubspec.yaml correctly.

{{cookiecutter.out_dir}}/ios/Podfile

@@ -66,6 +66,19 @@ end
 post_install do |installer|
   installer.pods_project.targets.each do |target|
     flutter_additional_ios_build_settings(target)
+    # Ensure rive_native's setup script runs from the project root so pubspec.yaml is found in CI.
+    if target.name == 'rive_native'
+      target.shell_script_build_phases.each do |phase|
+        script = phase.shell_script
+        next unless script&.include?('rive_native:setup')
+        next if script.include?('PROJECT_ROOT="${SRCROOT}/../.."')
+
+        phase.shell_script = script.sub(
+          "set -e\n",
+          "set -e\nPROJECT_ROOT=\"${SRCROOT}/../..\"\ncd \"$PROJECT_ROOT\"\n"
+        )
+      end
+    end
 
     target.build_configurations.each do |config|
       config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
@@ -85,4 +98,4 @@ post_install do |installer|
       ]
     end
   end
-end
+end