[integration_test] fix zip command (#74473)

packages/integration_test/README.md

@@ -226,7 +226,7 @@ Execute this script at the root of your Flutter app:
 
 ```sh
 output="../build/ios_integ"
-product="$output/Build/Products"
+product="build/ios_integ/Build/Products"
 dev_target="14.3"
 
 # Pass --simulator if building for the simulator.
@@ -234,7 +234,10 @@ flutter build ios integration_test/foo_test.dart -release
 
 pushd ios
 xcodebuild -workspace Runner.xcworkspace -scheme Runner -config Flutter/Release.xcconfig -derivedDataPath $output -sdk iphoneos build-for-testing
-zip -r "$output/ios_tests.zip" "$product/Release-iphoneos" "$product/Runner_iphoneos$dev_target-arm64.xctestrun"
+popd
+
+pushd $product
+zip -r "ios_tests.zip" "Release-iphoneos" "Runner_iphoneos$dev_target-arm64.xctestrun"
 popd
 ```