Support multi-stage docker build. (#229)

* support multi-stage docker image.

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

* update docker image

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

* test docker image.

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

* test docker image.

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

* fix image name

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

* update tag

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

* update drone config.

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

.drone.yml

@@ -23,8 +23,6 @@ pipeline:
       - coverage all
       # send coverage report
       - make coverage
-      # build binary for docker image
-      - make docker_build
 
   release:
     image: appleboy/golang-testing
@@ -40,6 +38,7 @@ pipeline:
 
   publish_latest:
     image: plugins/docker
+    pull: true
     repo: ${DRONE_REPO}
     tags: [ 'latest' ]
     secrets: [ docker_username, docker_password ]
@@ -50,6 +49,7 @@ pipeline:
 
   publish_tag:
     image: plugins/docker
+    pull: true
     repo: ${DRONE_REPO}
     tags: [ '${DRONE_TAG}' ]
     secrets: [ docker_username, docker_password ]

Dockerfile

@@ -1,8 +1,14 @@
+# build stage
+FROM appleboy/golang-testing AS build-env
+ADD . /go/src/github.com/appleboy/gorush
+RUN cd /go/src/github.com/appleboy/gorush && make docker_build
+
+# final stage
 FROM centurylink/ca-certs
 EXPOSE 8088
 
 ADD config/config.yml /
-ADD bin/gorush /
+COPY --from=build-env /go/src/github.com/appleboy/gorush/bin/gorush /
 
 ENTRYPOINT ["/gorush"]
 CMD ["-c", "config.yml"]

Makefile

@@ -134,7 +134,7 @@ docker_build:
 docker_image:
 	docker build -t $(DEPLOY_ACCOUNT)/$(DEPLOY_IMAGE) -f Dockerfile .
 
-docker_release: docker_build docker_image
+docker_release: docker_image
 
 docker_deploy:
 ifeq ($(tag),)