message: Use new builder image with updated yarn and node.js.
diff: @@ -11,7 +11,7 @@ set -e
  # Without env vars:
  # ./builder-run ./my-script --my-script-arg1 --my-script-arg2
  -BUILDER_IMAGE="quay.io/coreos/tectonic-console-builder:v14"
  +BUILDER_IMAGE="quay.io/coreos/tectonic-console-builder:v15"
  # forward whitelisted env variables to docker
  ENV_STR=""
  