ci: build multi-arch image

Dockerfile

@@ -1,14 +1,21 @@
-FROM node:slim
+# Stage 1: Build the application
+FROM node:slim AS builder
 
-RUN mkdir /app
 WORKDIR /app
 
 COPY package*.json ./
+RUN npm cache clean --force
 RUN npm install
 
 COPY ./ ./
 
+# Stage 2: Create the production image
+FROM node:slim
+
+WORKDIR /app
+
+COPY --from=builder /app .
+
 EXPOSE 3000
 
 CMD ["npm", "run", "start-app"]
-