Clojurians Log v2

I'm trying to run docker on windows. It seems that docker isn't saving lein deps, anyone else seen this? My dockerfile is for a ring compojure-api application

FROM clojure
ADD . /app
WORKDIR /app
RUN lein deps
CMD lein ring server-headless

Then lein says that ring is not a task, even though it is defined and runs fine outside of docker