build(app): optimize app docker image by use Next.js standalone output

app.dockerfile

@@ -1,9 +1,4 @@
-FROM node:alpine
+FROM node:alpine as builder
-
-ARG NEXT_PUBLIC_WS_URL
-ARG NEXT_PUBLIC_API_URL
-ENV NEXT_PUBLIC_WS_URL=${NEXT_PUBLIC_WS_URL}
-ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
 
 WORKDIR /home/perplexica
 
@@ -12,4 +7,20 @@ COPY ui /home/perplexica/
 RUN yarn install
 RUN yarn build
 
-CMD ["yarn", "start"]
+FROM node:alpine as runner
+
+ARG NEXT_PUBLIC_WS_URL
+ARG NEXT_PUBLIC_API_URL
+ENV NEXT_PUBLIC_WS_URL=${NEXT_PUBLIC_WS_URL}
+ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
+
+WORKDIR /home/perplexica
+
+COPY --from=builder /home/perplexica/package.json .
+COPY --from=builder /home/perplexica/yarn.lock .
+COPY --from=builder /home/perplexica/next.config.mjs .
+COPY --from=builder /home/perplexica/.next/standalone .
+COPY --from=builder /home/perplexica/public ./public
+COPY --from=builder /home/perplexica/.next/static ./.next/static
+
+ENTRYPOINT ["node", "server.js"]

ui/next.config.mjs

@@ -1,5 +1,6 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
+  output: 'standalone',
   images: {
     remotePatterns: [
       {