update build_test.yml

.github/workflows/build_test.yml

@@ -22,6 +22,7 @@ jobs:
       - run: cd example
       - run: cd ios
       - run: pod update WechatOpenSDK-XCFramework
+      - run: cd ..
       - run: flutter build ios --no-codesign
 
   test_iOS_No_Pay:
@@ -41,6 +42,7 @@ jobs:
              sed -i.bak0 's/#    no_pay: true/    no_pay: true/' pubspec.yaml
              cd ios
              pod update OpenWeChatSDKNoPay
+             cd ..
              flutter build ios --no-codesign
 
   test_android: