feat: add multiple stage build for docker. (#96)

* feat: add multiple stage build for docker.

* remove unused target

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

.drone.yml

@@ -25,8 +25,6 @@ pipeline:
       - coverage all
       - make coverage
       - make build
-      # build binary for docker image
-      - make static_build
     when:
       event: [ push, tag, pull_request ]
 

Dockerfile

@@ -1,3 +1,7 @@
+FROM appleboy/golang-testing AS build-env
+ADD . /go/src/github.com/appleboy/drone-ssh
+RUN cd /go/src/github.com/appleboy/drone-ssh && make static_build
+
 FROM alpine:3.4
 
 RUN apk update && \
@@ -6,5 +10,5 @@ RUN apk update && \
     openssh-client && \
   rm -rf /var/cache/apk/*
 
-ADD drone-ssh /bin/
+COPY --from=build-env /go/src/github.com/appleboy/drone-ssh/drone-ssh /bin
 ENTRYPOINT ["/bin/drone-ssh"]

Makefile

@@ -109,14 +109,12 @@ release-check:
 	cd $(DIST)/release; $(foreach file,$(wildcard $(DIST)/release/$(EXECUTABLE)-*),sha256sum $(notdir $(file)) > $(notdir $(file)).sha256;)
 
 # for docker.
-static_build:
+docker_build:
 	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 $(GO) build -a -tags '$(TAGS)' -ldflags '$(EXTLDFLAGS)-s -w $(LDFLAGS)' -o $(DEPLOY_IMAGE)
 
 docker_image:
 	docker build -t $(DEPLOY_ACCOUNT)/$(DEPLOY_IMAGE) .
 
-docker: static_build docker_image
-
 docker_deploy:
 ifeq ($(tag),)
 	@echo "Usage: make $@ tag=<tag>"