multi-arch build

frontend/Dockerfile

@@ -1,6 +1,9 @@
-# syntax=docker/dockerfile:1
+# syntax=docker/dockerfile:1.6
 
-FROM node:20-alpine AS build
+ARG NODE_IMAGE=node:20-alpine
+ARG NGINX_IMAGE=nginx:alpine
+
+FROM --platform=$BUILDPLATFORM ${NODE_IMAGE} AS build
 WORKDIR /app
 
 COPY package.json package-lock.json ./
@@ -9,7 +12,7 @@ RUN npm ci --no-audit --no-fund
 COPY . .
 RUN npm run build
 
-FROM nginx:alpine
+FROM ${NGINX_IMAGE}
 WORKDIR /usr/share/nginx/html
 
 COPY --from=build /app/dist ./