feat: downsize docker image

Dockerfile

@@ -1,9 +1,4 @@
-FROM plugins/base:amd64
-
-LABEL maintainer="Bo-Yi Wu <appleboy.tw@gmail.com>" \
-  org.label-schema.name="Drone Packer" \
-  org.label-schema.vendor="Bo-Yi Wu" \
-  org.label-schema.schema-version="1.0"
+FROM plugins/base:amd64 AS builder
 
 RUN apk add --no-cache ca-certificates \
   wget && \
@@ -14,5 +9,13 @@ RUN wget -q https://releases.hashicorp.com/packer/${PACKER_VERSION}/packer_${PAC
   unzip packer.zip -d /bin && \
   rm -f packer.zip
 
+FROM plugins/base:multiarch
+
+LABEL maintainer="Bo-Yi Wu <appleboy.tw@gmail.com>" \
+  org.label-schema.name="Drone Packer" \
+  org.label-schema.vendor="Bo-Yi Wu" \
+  org.label-schema.schema-version="1.0"
+
+COPY --from=builder bin/packer /bin/
 ADD release/linux/amd64/drone-packer /bin/
 ENTRYPOINT ["/bin/drone-packer"]

README.md

@@ -6,7 +6,6 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/appleboy/drone-packer)](https://goreportcard.com/report/github.com/appleboy/drone-packer)
 [![Docker Pulls](https://img.shields.io/docker/pulls/appleboy/drone-packer.svg)](https://hub.docker.com/r/appleboy/drone-packer/)
 [![](https://images.microbadger.com/badges/image/appleboy/drone-packer.svg)](https://microbadger.com/images/appleboy/drone-packer "Get your own image badge on microbadger.com")
-[![Release](https://github-release-version.herokuapp.com/github/appleboy/drone-packer/release.svg?style=flat)](https://github.com/appleboy/drone-packer/releases/latest)
 [![Build status](https://ci.appveyor.com/api/projects/status/pmkfbnwtlf1fm45l/branch/master?svg=true)](https://ci.appveyor.com/project/appleboy/drone-packer/branch/master)
 
 Drone plugin for build Automated machine images with [Packer](https://www.packer.io/). For the usage information and a listing of the available options please take a look at [the docs](http://plugins.drone.io/drone-plugins/drone-packer/).