fix(cli): properly resolve merge config on mobile build closes #9970 (#10605)

just applying the change from #10600 to xcode to fix the linked issue :)

Author: lucasfernog

.changes/fix-config-override.md

@@ -0,0 +1,6 @@
+---
+"tauri-cli": patch:bug
+"@tauri-apps/cli": patch:bug
+---
+
+Fixes `[android|ios] build --config <config>` failing to resolve.

tooling/cli/src/mobile/ios/xcode_script.rs

@@ -95,6 +95,10 @@ pub fn command(options: Options) -> Result<()> {
     MobileTarget::Ios,
   )?;
 
+  if let Some(config) = &cli_options.config {
+    crate::helpers::config::merge_with(&config.0)?;
+  }
+
   let env = env()?.explicit_env_vars(cli_options.vars);
 
   if !options.sdk_root.is_dir() {