From node:18-bullseye as builder

WORKDIR devel/
RUN apt-get update ; apt-get upgrade -y ; apt-get install -y python-is-python3 build-essential git
RUN git clone https://github.com/MathMan05/JankClient
RUN cd JankClient ; npm i ; npm run build

From node:18-alpine

EXPOSE 8080
WORKDIR exec
RUN apk add --update git nodejs npm
COPY --from=builder /devel/JankClient/ . 
RUN adduser -D jankclient

USER jankclient

CMD ["npm", "start"]