Change Dockerfile.initialize to multilevel build

Dockerfile.initialize

@@ -1,7 +1,15 @@
-FROM golang:1.17
+FROM golang:1.17 as build
+LABEL description="Build container"
 
 ENV CGO_ENABLED 0
-COPY . /app
-WORKDIR /app
+COPY . /build
+WORKDIR /build
 RUN go build -o rcloud-init scripts/initialize/main.go
+
+FROM alpine:latest as runtime
+LABEL description="Run container"
+
+WORKDIR /usr/bin
+COPY --from=build /build/rcloud-init /usr/bin/rcloud-init
+COPY --from=build /build/scripts/initialize/ /usr/bin/scripts/initialize/
 ENTRYPOINT ["./rcloud-init"]