fix: update Dockerfile to install dependencies in packages/ui-kit

Author: christoph2806

Dockerfile

@@ -3,6 +3,10 @@ FROM node:20-alpine AS builder
 WORKDIR /app
 COPY package.json pnpm-lock.yaml ./
 RUN npm install -g pnpm && pnpm install
+COPY packages/ui-kit/package.json ./packages/ui-kit/
+WORKDIR /app/packages/ui-kit
+RUN pnpm install
+WORKDIR /app
 COPY . .
 RUN pnpm build