Implemented multistage building in the Dockerfile to reduce file size

Dockerfile

@@ -1,7 +1,5 @@
-FROM node:20-alpine
-RUN apk add g++ make cmake python3 --no-cache
-
-ENV NODE_ENV=production
+FROM node:20-alpine AS build
+RUN apk add g++ make cmake python3
 
 WORKDIR /myspeed
 
@@ -13,7 +11,17 @@ RUN npm install
 RUN cd client && npm install --force
 RUN npm run build
 RUN mv /myspeed/client/build /myspeed
-RUN rm -rf /myspeed/client
+
+FROM node:20-alpine
+
+ENV NODE_ENV=production
+
+WORKDIR /myspeed
+
+COPY --from=build /myspeed/build /myspeed/build
+COPY --from=build /myspeed/server /myspeed/server
+COPY --from=build /myspeed/node_modules /myspeed/node_modules
+COPY --from=build /myspeed/package.json /myspeed/package.json
 
 VOLUME ["/myspeed/data"]