adding extra programs to palantir docker image

[adnsimona]

Not a bug, just a question or feature request.
So I'm trying to make healthcheck with docker compose on the palantir-made docker image/container.
In the container there are no curl or wget commands, and I'm trying to find a way to install one inside the image.
Is there a current way of adding/installing a custom command line app to the image made by palantir? Like making a dockerfile for it?

[adnsimona]

Ok. Found in the docs how to add a dockerfile. My following question is: which image does the docker gradle task base on the image, when no dockerfile is specified?