add protobuf-schema-config-complex to CI

Author: lucy66hw

.github/workflows/samples-protobuf.yaml

@@ -20,6 +20,7 @@ jobs:
         sample:
           - 'samples/config/petstore/protobuf-schema/'
           - 'samples/config/petstore/protobuf-schema-config/'
+          - 'samples/config/petstore/protobuf-schema-config-complex/'
     steps:
       - uses: actions/checkout@v4
       - name: Install Protocol Buffers Compiler