docs(rest-proxy): add comment (#2975)

proxies/rest/Dockerfile

@@ -1,26 +1,48 @@
+# we node 18 alpine 3.17 as base image
+# we use multi stage build in this file
+# deps: contain all dependencies including dev dependencies
+# builder: contains all compiled files
+# prod-deps: contains only dependencies excluding dev dependencies
+# runner: the final image, with only the dependencies and compiled files
+
 FROM node:18.15.0-alpine3.17 AS deps
 WORKDIR /app
+# copy necessary for install dependencies
 COPY package.json yarn.lock ./
+# install dependencies
 RUN yarn install
 
+# use node alpine as base image
 FROM node:18.15.0-alpine3.17 as builder
+# copy the dependencies (node_modules) from the deps image
 COPY --from=deps /app /app
 WORKDIR /app
+# copy the source files
 COPY src/ src/
+# copy the compiler config
 COPY .swcrc ./
+# compile the files
 RUN yarn build
 
 FROM node:18.15.0-alpine3.17 AS prod-deps
 WORKDIR /app
+# copy necessary for install dependencies
 COPY package.json yarn.lock .yarnrc.yml ./
+# config yarn to install only prod dependencies
 RUN yarn set version berry
 RUN yarn plugin import workspace-tools
+# install prod dependencies
 RUN yarn workspaces focus --all --production
 
 FROM node:18.15.0-alpine3.17 as runner
+# copy the compiled files from the builder image
 COPY --from=builder /app/dist /app/dist
+# copy the prod dependencies (node_modules) from the prod-deps image
 COPY --from=prod-deps /app/node_modules /app/node_modules
 WORKDIR /app
+# copy necessary files
 COPY package.json ./
+# open port 8000
 EXPOSE 8000
+# set default command
 CMD ["yarn" ,"start"]