fix(ci): add flutter pub get before CocoaPods to generate Generated.xcconfig

Author: Suyunmeng

.github/workflows/build.yaml

@@ -346,6 +346,13 @@ jobs:
           ls -la ${{ github.workspace }}/ios/Frameworks/ || echo "Frameworks directory not found"
           find ${{ github.workspace }}/ios/Frameworks -name "*.xcframework" -type d || echo "No xcframework found"
 
+      - name: Install Flutter Dependencies
+        run: |
+          echo "Installing Flutter dependencies..."
+          flutter pub get
+          echo "Verifying Generated.xcconfig..."
+          ls -la ${{ github.workspace }}/ios/Flutter/Generated.xcconfig
+
       - name: Setup CocoaPods
         run: |
           cd ${{ github.workspace }}/ios