examples: reduce image size in Docker example

examples/with-docker/Dockerfile

@@ -19,18 +19,23 @@ WORKDIR /app
 
 ENV NODE_ENV production
 
+RUN addgroup -g 1001 -S nodejs
+RUN adduser -S nextjs -u 1001
+
 # You only need to copy next.config.js if you are NOT using the default configuration
 # COPY --from=builder /app/next.config.js ./
 COPY --from=builder /app/public ./public
-COPY --from=builder /app/.next ./.next
+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
 
-RUN addgroup -g 1001 -S nodejs
-RUN adduser -S nextjs -u 1001
-RUN chown -R nextjs:nodejs /app/.next
 USER nextjs
 
 EXPOSE 3000
 
+# Next.js collects completely anonymous telemetry data about general usage.
+# Learn more here: https://nextjs.org/telemetry
+# Uncomment the following line in case you want to disable telemetry.
+# ENV NEXT_TELEMETRY_DISABLED 1
+
 CMD ["yarn", "start"]