message: Use the latest builder, which has go 1.8. 1.8 is needed for reverseProxy's modifyResponse.
diff: # ./builder-run ./my-script --my-script-arg1 --my-script-arg2
  -BUILDER_IMAGE=quay.io/coreos/tectonic-console-builder:v7
  +BUILDER_IMAGE=quay.io/coreos/tectonic-console-builder:v8
  # forward whitelisted env variables to docker
  ENV_STR=""
  