Using build-wrapper on circleci orb could be easier, probably

Hello,

I’m setting up a new C++ project to benefit of your wonderful tool. This time, I gave a try to the new circleci orb thing. The result is here: https://github.com/mquinson/tiny_simgrid/blob/master/.circleci/config.yml

As you can see, I have to customize things a bit to get it working. I have this step:

      - run:
          name: sonarcloud needs some extra love
          command: |
            apt update && apt install -y curl
            wget https://sonarcloud.io/static/cpp/build-wrapper-linux-x86.zip
            unzip build-wrapper-linux-x86.zip
            cp build-wrapper-linux-x86/libinterceptor-x86_64.so build-wrapper-linux-x86/libinterceptor-haswell.so

I should improve my image to directly install curl there, but I’m wondering whether downloading the build-wrapper could be done by the orb directly (possibly through a specific step).

Thanks for your great work,
Mt