reverse-proxy-frontend/Dockerfile

# build environment
FROM node:16-slim as builder
WORKDIR /app

COPY package*.json ./
RUN npm install

COPY . ./
#RUN ls
RUN npm run build

# production environment
FROM node:12-slim
ARG APP_SUBFOLDER=reverse-proxy

COPY --from=builder /app/build ./application/${APP_SUBFOLDER}
COPY --from=builder /app/build/index.html ./application/

#install static server
RUN npm install -g serve

#set workdir to root
WORKDIR /

EXPOSE 80

CMD ["sh", "-c", "serve -s application -p 80"]