fix(cli): let xcode handle building for ios build --open (#12406)

Co-authored-by: Fabian-Lars <github@fabianlars.de>

Author: bradleat

.changes/change-pr-12406.md

@@ -0,0 +1,6 @@
+---
+"@tauri-apps/cli": "patch:enhance"
+"tauri-cli": "patch:enhance"
+---
+
+`ios build --open` will now let xcode start the rust build process.

crates/tauri-cli/src/mobile/ios/build.rs

@@ -293,6 +293,10 @@ fn run_build(
     cli_options,
   )?;
 
+  if options.open {
+    return Ok(handle);
+  }
+
   let mut out_files = Vec::new();
 
   call_for_targets_with_fallback(