dev docker, without error, idk work hot reload or not

backend/Dockerfile.dev

@@ -0,0 +1,9 @@
+FROM node:lts-alpine
+WORKDIR /app
+RUN corepack enable && corepack prepare pnpm@latest --activate
+COPY package.json pnpm-*.yaml ./
+RUN pnpm install --frozen-lockfile
+COPY . .
+RUN pnpm build
+EXPOSE 3000
+CMD [ "pnpm", "start:dev" ]