Use entrypoint /nodejs/bin/node

Author: murgatroid99

packages/grpc-js-xds/interop/Dockerfile

@@ -35,4 +35,4 @@ COPY --from=build /node/src/grpc-node/packages/grpc-js-xds ./packages/grpc-js-xd
 ENV GRPC_VERBOSITY="DEBUG"
 ENV GRPC_TRACE=xds_client,xds_resolver,cds_balancer,eds_balancer,priority,weighted_target,round_robin,resolving_load_balancer,subchannel,keepalive,dns_resolver,fault_injection,http_filter,csds,outlier_detection
 
-ENTRYPOINT [ "node", "/node/src/grpc-node/packages/grpc-js-xds/build/interop/xds-interop-client" ]
+ENTRYPOINT [ "/nodejs/bin/node", "/node/src/grpc-node/packages/grpc-js-xds/build/interop/xds-interop-client" ]