Reduce size of Dockerized NestJS from 7XXMB to 185MB

nestjs.Dockerfile

# -------------------------------------------
# Prepare runner

FROM node:18-alpine AS runner

RUN apk update && \
    apk add curl bash g++ make && \
    rm -rf /var/cache/apk/*

# Install node-prune (https://github.com/tj/node-prune)
RUN curl -sf https://gobinaries.com/tj/node-prune | sh

# Adding nestjs cli to runner not a project
# @nestjs/cli requires in any project. 
# You should add it into `devDependency`
# instead of `dependency` in package.json.
RUN npm install -g @nestjs/cli

# -------------------------------------------

FROM runner AS dependencies

WORKDIR /var/www/nest/miniapp-gateway


# For me, some dependency what I need in my organize,
# it need to sync with Bitbucket via SSH key.

# RUN apk add -qU openssh git && \
#     mkdir /root/.ssh && \
#     chmod 0700 /root/.ssh && \
#     ssh-keyscan -t rsa bitbucket.org >> /root/.ssh/known_hosts && \
#     echo "$SSH_PRV_KEY" > /root/.ssh/id_rsa && \
#     chmod 600 /root/.ssh/id_rsa


# Copy package.json then install all dependency 
# excluding `devDependency`.
COPY package*.json .
RUN npm install --only=production

# -------------------------------------------

FROM runner AS builder

WORKDIR /var/www/nest/miniapp-gateway

# Copy dependency from stage `dependencies`.
COPY --from=dependencies /var/www/nest/miniapp-gateway/node_modules ./node_modules

COPY . .
RUN npm run build

# Run node prune
RUN /usr/local/bin/node-prune

# Remove unused source
RUN rm -rf node_modules/rxjs/src/ && \
    rm -rf node_modules/rxjs/bundles/ && \
    rm -rf node_modules/rxjs/_esm5/ && \
    rm -rf node_modules/rxjs/_esm2015/ && \
    rm -rf node_modules/swagger-ui-dist/*.map

# -------------------------------------------

# Create new container then copy all output of each stage
FROM node:18-alpine AS production

WORKDIR /var/www/nest/miniapp-gateway

COPY --from=builder /var/www/nest/miniapp-gateway/node_modules ./node_modules
COPY --from=builder /var/www/nest/miniapp-gateway/dist ./dist

# Start your service by using command below :
# $node dist/main.js
# (in this case, it is in entrypoint.sh)
COPY entrypoint.sh .
RUN chmod +x /var/www/nest/miniapp-gateway/entrypoint.sh
CMD ["sh", "entrypoint.sh"]