build: Cross compilation

Dockerfile

@@ -1,18 +1,29 @@
-FROM node:alpine
+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
-WORKDIR /portainer-backup
-VOLUME "/backup"
+
 RUN npm install --omit=dev
 
+FROM node:alpine as runner
+ENV NODE_ENV=production
+
+RUN apk update && apk add --no-cache tzdata
+
+VOLUME "/backup"
+WORKDIR /portainer-backup
+
+COPY --from=builder /portainer-backup /portainer-backup
+
 # DEFAULT ENV VARIABLE VALUES
 ENV TZ="America/New_York" 
 ENV PORTAINER_BACKUP_URL="http://portainer:9000"