Issue with curl command in dockerfile

The command "RUN curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -"
leads to an error on build. 

```
executor failed running [/bin/sh -c curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -]: exit code: 1
ERROR: Service 'web' failed to build : Build failed
```