Backend: Improve Dockerfile to reduce image size

Dockerfile

@@ -1,6 +1,4 @@
-# Used by Docker and Cloud Run
-
-FROM node:16.13.1-slim as build
+FROM node:16.13.1-slim as client
 
 WORKDIR /crisp-react/server
 COPY ./server/ .
@@ -9,20 +7,24 @@ WORKDIR /crisp-react/client
 COPY ./client/ .
 RUN yarn && yarn build:prod
 
-FROM node:16.13.1-slim as prod
+FROM node:16.13.1-slim as server
+WORKDIR /crisp-react/server
+COPY ./server/ .
+COPY --from=client /crisp-react/client/config/ /crisp-react/server/config/
+RUN yarn && yarn compile
 
+FROM node:16.13.1-slim as prod
 RUN apt-get update -qq && apt-get upgrade -qq \
   && apt-get clean autoclean && apt-get autoremove -y \
   && rm -rf \
     /var/lib/cache \
     /var/lib/log
-
 WORKDIR /crisp-react/server
-COPY ./server/ .
-COPY --from=build /crisp-react/client/config/ /crisp-react/server/config/
-RUN yarn && yarn compile
-
-COPY --from=build /crisp-react/client/dist/ /crisp-react/server/build/client/static/
+COPY ./server/package.json ./server/yarn.lock ./
+COPY --from=server /crisp-react/server/build/ ./build/
+COPY --from=server /crisp-react/server/pub/ ./pub/
+COPY --from=server /crisp-react/server/config/ ./config/
+RUN yarn install --production=true
 RUN find /crisp-react -type d -not -perm 755 -exec chmod 755 {} \;
 RUN find /crisp-react -type f -not -perm 644 -exec chmod 644 {} \;