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Yarn is a popular JavaScript package manager that is often used as an alternative to npm. To install Yarn, your Layerfile will include something like this:
Layerfile
FROM vm/ubuntu:18.04
# To note: Layerfiles create entire VMs, *not* containers!
RUN curl -fSsL https://deb.nodesource.com/setup_14.x | bash && \
    curl -fSsL https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
    echo "deb https://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list && \
    apt-get update && \
    apt-get install nodejs yarn
COPY . .
RUN yarn install --frozen-lockfile
RUN BACKGROUND yarn start
EXPOSE WEBSITE http://localhost:3000
Information on optimizing and troubleshooting Yarn in webapp.io can be found here.