FROM --platform=$BUILDPLATFORM golang:1.18 as build-env

# xx wraps go to automatically configure $GOOS, $GOARCH, and $GOARM
# based on TARGETPLATFORM provided by Docker.
COPY --from=tonistiigi/xx:golang-1.0.0 / /

ARG APP_FOLDER

ADD . ${APP_FOLDER}
WORKDIR ${APP_FOLDER}

# Compile independent executable using go wrapper from xx:golang
ARG TARGETPLATFORM
RUN CGO_ENABLED=0 go build -a -ldflags '-extldflags "-static"' -o /bin/main ./cmd/nfs-subdir-external-provisioner

FROM --platform=$TARGETPLATFORM alpine:3.12

RUN apk update --no-cache && apk add ca-certificates
COPY --from=build-env /bin/main /app/main

ENTRYPOINT ["/app/main"]