Improved docker build process

Dockerfile

@@ -16,9 +16,12 @@ RUN CGO_ENABLED=0 make local build
 
 # Choose alpine as a base image to make this useful for CI, as many
 # CI tools expect an interactive shell inside the container
-FROM alpine:3.7
+FROM alpine:3.7 as production
 
 COPY --from=builder /go/src/mikefarah/yq/yq /usr/bin/yq
 RUN chmod +x /usr/bin/yq
 
+ARG VERSION=none
+LABEL version=${VERSION}
+
 WORKDIR /workdir

release_instructions.txt

@@ -25,6 +25,7 @@
 
 - docker
   - build and push latest and new version tag
+  - docker build .  --arg -t mikefarah/yq:latest -t mikefarah/yq:VERSION 
 
 - debian package
   - execute 

scripts/publish-docker.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+set -ex
+VERSION="$(git describe --tags --abbrev=0)"
+docker build \
+  --target production \
+  --build-arg VERSION=${VERSION} \
+  -t mikefarah/yq:latest \
+  -t mikefarah/yq:${VERSION} \
+  .