Dockerfile

FROM node

RUN useradd -m -u 1001 user

ENV HOME=/home/user
ENV PATH=/home/user/.local/bin:$PATH

USER user

WORKDIR $HOME/app

RUN --mount=type=secret,id=URL,mode=0444,required=true \

  git clone $(cat /run/secrets/URL) .

RUN npm install

CMD ["node", "backend/index.js"]