The official Drone command line tools include commands for working with the autoscaler. Please see these installation documents to install the latest version of the command line tools.
Install on Linux:
curl -L https://github.com/drone/drone-cli/releases/download/v0.8.5/drone_linux_amd64.tar.gz | tar zx sudo install -t /usr/local/bin drone
Install on OSX:
brew tap drone/drone brew install drone