From 40be6866b02364191ffcc6de9f618c593938e78f Mon Sep 17 00:00:00 2001
From: Damir Mukimov <mukimov.d@gmail.com>
Date: Thu, 27 Nov 2025 06:54:20 +0100
Subject: [PATCH] fix: optimize Dockerfile to use Yarn PnP instead of
 node-modules

- Use Yarn Plug'n'Play (PnP) for faster installs and smaller image size
- Keep .yarnrc.yml configuration instead of overriding it
- Copy PnP files (.pnp.cjs, .pnp.loader.mjs, .yarn cache) to production stage
- Use yarn workspaces focus --production for production dependencies
- Corepack manages Yarn version while PnP handles dependency resolution
---
 Dockerfile | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index 070864b..8807d00 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Multi-stage build for Node.js frontend application
-FROM node:22.21.1-alpine3.20 AS builder
+FROM node:iron-alpine3.22 AS builder
 
 # Enable Corepack for Yarn 4.x
 RUN corepack enable
@@ -7,10 +7,10 @@ RUN corepack enable
 # Set working directory
 WORKDIR /app
 
-# Copy package files
-COPY package.json yarn.lock ./
+# Copy Yarn configuration and package files
+COPY .yarnrc.yml package.json yarn.lock ./
 
-# Install dependencies
+# Install dependencies (uses PnP by default from .yarnrc.yml)
 RUN yarn install --immutable
 
 # Copy source code
@@ -20,25 +20,27 @@ COPY . .
 RUN yarn build
 
 # Production stage
-FROM node:22.21.1-alpine3.20 AS production
+FROM node:iron-alpine3.22 AS production
 
 # Enable Corepack for Yarn 4.x
 RUN corepack enable
 
 # Create app user
-RUN addgroup -g 1001 -S nodejs
-RUN adduser -S nextjs -u 1001
+RUN addgroup -g 1001 -S nodejs && \
+  adduser -S nextjs -u 1001
 
 # Set working directory
 WORKDIR /app
 
-# Copy package files
-COPY package.json yarn.lock ./
+# Copy Yarn configuration and package files
+COPY .yarnrc.yml package.json yarn.lock ./
 
-# Install all dependencies first, then clean up dev dependencies
-RUN yarn install --immutable && yarn autoclean --force
+# Install production dependencies (uses PnP)
+RUN yarn workspaces focus --production
 
-# Copy built application from builder stage
+# Copy PnP files and built application from builder stage
+COPY --from=builder --chown=nextjs:nodejs /app/.pnp.cjs /app/.pnp.loader.mjs ./
+COPY --from=builder --chown=nextjs:nodejs /app/.yarn ./.yarn
 COPY --from=builder --chown=nextjs:nodejs /app/dist ./dist
 
 # Switch to non-root user