Getting NVM setup in a docker image

Dockerfile

# Replace shell with bash so we can source files
RUN rm /bin/sh && ln -s /bin/bash /bin/sh
RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections
RUN mkdir -p /usr/local/nvm
ENV NVM_DIR /usr/local/nvm
ENV NODE_VERSION 21.6.1

RUN wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.7/install.sh | bash \
    && . $NVM_DIR/nvm.sh \
    && nvm install $NODE_VERSION \
    && nvm alias default $NODE_VERSION \
    && nvm use default