fix(tup-cms): build tup-ui fails inside docker

In `epic/TUP-700…` branch:
1. `npm ci`
2. `npx nx build tup-cms`
3. Error building core-components as required by `npx nx build tup-ui`.

In `main` branch:
1. `npm ci`
2. `npx nx build tup-cms`
3. No error.

apps/tup-cms/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:20 as node_build
+FROM --platform=linux/amd64 node:20 as node_build
 COPY package.json package-lock.json /code/
 WORKDIR /code
 RUN npm ci