update Docker build to optimize image size

.dockerignore

@@ -0,0 +1,4 @@
+node_modules
+.next
+.vscode
+.git

Dockerfile

@@ -1,39 +1,14 @@
-FROM node:18-alpine AS deps
+FROM node:18-alpine as builder
-RUN apk add --no-cache libc6-compat
 WORKDIR /app
-
-COPY package.json package-lock.json ./
-RUN npm ci 
-
-# Rebuild the source code only when needed
-FROM node:18-alpine AS builder
-WORKDIR /app
-
 COPY . .
-COPY --from=deps /app/node_modules ./node_modules
+RUN npm install --include=dev
-
-ENV NEXT_TELEMETRY_DISABLED 1
-
 RUN npm run build
 
 FROM node:18-alpine AS runner
 WORKDIR /app
-
+COPY --from=builder /app/.next/standalone .
-ENV NODE_ENV production
-ENV NEXT_TELEMETRY_DISABLED 1
-
-RUN addgroup --system --gid 1001 nodejs
-RUN adduser --system --uid 1001 nextjs
-
-COPY --from=builder --chown=nextjs:nodejs /app/.next ./.next
-COPY --from=builder /app/node_modules ./node_modules
-COPY --from=builder /app/package.json ./package.json
 COPY --from=builder /app/public ./public
-
+COPY --from=builder /app/.next/static ./.next/static
-USER nextjs
 
 EXPOSE 3000
-
+CMD ["node", "server.js"]
-ENV PORT 3000
-
-CMD ["npm", "start"]

next.config.js

@@ -5,6 +5,7 @@ const nextConfig = {
   // building the app. Since pdfjs-dist is only used on client side, we disable
   // the canvas package for webpack
   // https://github.com/mozilla/pdf.js/issues/16214
+  output: 'standalone',
   webpack: (config) => {
     // Setting resolve.alias to false tells webpack to ignore a module
     // https://webpack.js.org/configuration/resolve/#resolvealias