chore: fix container build and minimize container size (#380)

Dockerfile

@@ -1,7 +1,18 @@
-FROM node:16-alpine
+FROM node:16-alpine as build-stage
+
+WORKDIR /app
 RUN corepack enable
-WORKDIR /root/app
+
+COPY .npmrc package.json pnpm-lock.yaml ./
+RUN --mount=type=cache,id=pnpm-store,target=/root/.pnpm-store \
+    pnpm install --frozen-lockfile
+
 COPY . .
-RUN pnpm i --prod
 RUN pnpm build
-CMD pnpm preview --host
+
+FROM nginx:stable-alpine as production-stage
+
+COPY --from=build-stage /app/dist /usr/share/nginx/html
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]