contrib: Dockerfile: use build-arg for go-version
# 3.) $ make binaries install test
#
+ARG GOLANG_VERSION=1.11
+
# Install proto3
-FROM golang:1.11 AS proto3
+FROM golang:${GOLANG_VERSION} AS proto3
RUN apt-get update && apt-get install -y autoconf automake g++ libtool unzip
COPY script/setup/install-protobuf install-protobuf
RUN ./install-protobuf
# Install runc
-FROM golang:1.11 AS runc
+FROM golang:${GOLANG_VERSION} AS runc
RUN apt-get update && apt-get install -y curl libseccomp-dev
COPY vendor.conf /go/src/github.com/containerd/containerd/vendor.conf
COPY script/setup/install-runc install-runc
RUN ./install-runc
-FROM golang:1.11
+FROM golang:${GOLANG_VERSION} AS dev
RUN apt-get update && apt-get install -y btrfs-tools gcc git libseccomp-dev make xfsprogs
COPY --from=proto3 /usr/local/bin/protoc /usr/local/bin/protoc
