How to build project using dockerfile

[calbch]

I am using the following dockerfile to set up my loopback backend in a docker-compose file

FROM node:16-slim

USER node

RUN mkdir -p /home/node/app

WORKDIR /home/node/app

COPY --chown=node package*.json ./

RUN npm install

COPY --chown=node . .

RUN npm run build 

ENV HOST=0.0.0.0 PORT=3000

EXPOSE ${PORT}
CMD [ "node", "." ]

since build behaves different than in any other project I previously encountered, I tried using npm run clean && npm run build which also does not work. During development I fixed that by adding a command that rebuilds before running docker-compose up to ensure that /dist is present. How can I build the app only using the dockerfile?

[calbch]

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