feat: add Dockerfile (#124)

Dockerfile

@@ -0,0 +1,22 @@
+FROM node:20-alpine as build-stage
+
+WORKDIR /app
+RUN corepack enable
+
+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 build
+
+# SSR
+FROM node:20-alpine as production-stage
+
+WORKDIR /app
+
+COPY --from=build-stage /app/.output ./.output
+
+EXPOSE 3000
+
+CMD ["node", ".output/server/index.mjs"]