build: Target platform

Dockerfile

@@ -1,19 +1,26 @@
 FROM --platform=$BUILDPLATFORM node:alpine as builder
 
-ARG VERSION_ARG="0.0"
-ARG TARGETOS TARGETARCH
-ENV NODE_ENV=production
 WORKDIR /portainer-backup
 
-# INSTALL ADDITIONAL IMAGE DEPENDENCIES AND COPY APPLICATION TO IMAGE
 RUN apk update && apk add --no-cache tzdata
 RUN mkdir -p /portainer-backup/src
 COPY package.json /portainer-backup
 COPY src/*.js /portainer-backup/src
 RUN sed -i "s/0.0.0-development/${VERSION_ARG}/" /portainer-backup/package.json
 
-RUN npm install --omit=dev
+ARG VERSION_ARG="0.0"
+ARG TARGETPLATFORM
+ENV NODE_ENV=production
 
+RUN case ${TARGETPLATFORM} in \
+         "linux/amd64")  NPM_ARCH="x64" ;; \
+         "linux/arm64")  NPM_ARCH="arm64" ;; \
+         "linux/arm/v7") NPM_ARCH="arm" ;; \
+         "linux/arm/v6") NPM_ARCH="arm" ;; \
+         "linux/386")       NPM_ARCH="ia32" ;; \
+    esac \
+ && npm install --cpu=${NPM_ARCH} --os=linux --omit=dev
+
 FROM node:alpine as runner
 ENV NODE_ENV=production