chore: update dockerfile

Dockerfile

-# Build frontend dist.
-FROM node:18-alpine AS frontend
-WORKDIR /frontend-build
+# Build protobuf.
+FROM golang:1.21-alpine AS protobuf
+WORKDIR /protobuf-generate
 
 COPY . .
 
-WORKDIR /frontend-build/proto
+RUN GO111MODULE=on GOBIN=/usr/local/bin go install github.com/bufbuild/buf/cmd/buf@v1.26.1
 
-RUN npm i -g @bufbuild/buf
+WORKDIR /protobuf-generate/proto
 
 RUN buf generate
 
-WORKDIR /frontend-build/web
+# Build frontend dist.
+FROM node:18-alpine AS frontend
+WORKDIR /frontend-build
+
+COPY ./web .
+
+COPY --from=protobuf /protobuf-generate/web/src/types/proto ./src/types/proto
 
 RUN corepack enable && pnpm i --frozen-lockfile
 
@@ -21,7 +27,7 @@ FROM golang:1.21-alpine AS backend
 WORKDIR /backend-build
 
 COPY . .
-COPY --from=frontend /frontend-build/web/dist ./server/dist
+COPY --from=frontend /frontend-build/dist ./server/dist
 
 RUN CGO_ENABLED=0 go build -o memos ./main.go