ci: mark build ios optional

Author: tompsota

.github/workflows/ci.yml

@@ -97,6 +97,8 @@ jobs:
   build-ios:
     runs-on: macos-14
     needs: build-library
+    continue-on-error: true # currently build iOS is not working due to issues with XCode version
+
     steps:
       - name: Checkout
         uses: actions/checkout@v4