chore: set explicit xcode version to ios build on CI and fix toolchain error

Author: illuminati1911

.github/workflows/ci.yml

@@ -189,12 +189,22 @@ jobs:
     timeout-minutes: 45
     env:
       TURBO_CACHE_DIR: .turbo/ios
+    # Fix github runner issues with xcode 26 toolchains
+    # https://github.com/actions/runner-images/issues/13135#issuecomment-3722044150
     steps:
+      - name: Set Xcode Toolchain
+        shell: bash
+        run: |
+          echo "TOOLCHAINS=com.apple.dt.toolchain.XcodeDefault" >> $GITHUB_ENV
+
       - name: Checkout
         uses: actions/checkout@v4
 
       - name: Setup
         uses: ./.github/actions/setup
+      
+      - name: Select XCode 26.3
+        run: sudo xcode-select -s '/Applications/Xcode_26.3.0.app/Contents/Developer'
 
       - name: Cache turborepo for iOS
         uses: actions/cache@v3