Smallest possible debian image with librdkafka Go bindings?

Dockerfile

FROM    golang:1.11.2-stretch
RUN     apt-get update  -qq -y
RUN     apt-get install -qq -y build-essential ca-certificates file make gcc

ENV RDKAFKA_VERSION=0.11.6
ENV ZSTD_VERSION=1.3.5

# Install zstd from source (debian package is a bit old, doesn't have support for dictionary compression).
RUN     cd /root                                                              && \
        wget https://github.com/facebook/zstd/archive/v${ZSTD_VERSION}.tar.gz && \
        tar xzf v${ZSTD_VERSION}.tar.gz
WORKDIR /root/zstd-${ZSTD_VERSION}
RUN     cd /root/zstd-${ZSTD_VERSION}                                         && \
        make                                                                  && \
        make install

# Install librdkafka from source and Go bindings.
RUN     cd /root                                                                       && \
        wget https://github.com/edenhill/librdkafka/archive/v${RDKAFKA_VERSION}.tar.gz && \
        tar xzf v${RDKAFKA_VERSION}.tar.gz
WORKDIR /root/librdkafka-${RDKAFKA_VERSION}
RUN     STATIC_LIB_zstd=/root/zstd-1.3.5/lib/libzstd.a ./configure --enable-static --disable-sasl --disable-ssl
RUN     make
RUN     make install
RUN     rm -rf /root/librdkafka-${RDKAFKA_VERSION} /root/v${RDKAFKA_VERSION}.tar.gz
RUN     go get -ldflags '-linkmode external -extldflags "-static"' -tags 'static_all' github.com/confluentinc/confluent-kafka-go/kafka

WORKDIR /go/src/app
COPY    . .
RUN     go get   -ldflags '-linkmode external -extldflags "-static"' -tags 'static_all' -v
RUN     go build -ldflags '-linkmode external -extldflags "-static"' -tags 'static_all' -o /app
RUN     ldd /app

FROM debian:stretch-slim
COPY --from=0 /etc/ssl /etc/ssl
COPY --from=0 /app     /app
CMD  ["/app"]

main.go

package main

import (
	"fmt"

	"github.com/confluentinc/confluent-kafka-go/kafka"
)

func main() {
	_, _ = kafka.NewConsumer(&kafka.ConfigMap{})
	fmt.Println("hello world!")
}

Makefile

image: .image
.image: Dockerfile $(wildcard *.go)
	@docker build -t bsorahan/static-linking .
	@touch $@

clean:
	@rm -rf .image

.PHONY: clean image