fix: dockerfile slim

Dockerfile

@@ -1,11 +1,13 @@
+FROM node:18-alpine3.18 as webui
+RUN npm config set registry https://registry.npmmirror.com
+COPY ./webui .
+RUN npm install && npm run build
+
 FROM images.local/golang:latest
 
-WORKDIR /app
-
-COPY . /app
-RUN buf generate
-RUN cd webui && npm install && npm run build &&\
-         cd .. && go mod tidy && go build .
+COPY . .
+COPY --from=0 dist ./webui/dist
+RUN buf generate && go mod tidy && go build .
 
 EXPOSE 38080
 ENTRYPOINT [ "./pastebin", "api" ]