update makefiles: add “vendor” target in docker.Makefile…

… so that contributors don’t need “vndr” on their laptop

Signed-off-by: Gaetan de Villele <gdevillele@gmail.com>

docker.Makefile

@@ -4,41 +4,52 @@
 # Makefile for developing using Docker
 #
 
-+.PHONY: build_docker_image build_linter_image build clean test cross dev lint
-
 DEV_DOCKER_IMAGE_NAME = docker-cli-dev
 LINTER_IMAGE_NAME = docker-cli-lint
 MOUNTS = -v `pwd`:/go/src/github.com/docker/cli
 
 # build docker image (dockerfiles/Dockerfile.build)
+.PHONY: build_docker_image
 build_docker_image:
 	@docker build -q -t $(DEV_DOCKER_IMAGE_NAME) -f ./dockerfiles/Dockerfile.build .
 
-.PHONY: builder_linter_image
+# build docker image having the linting tools (dockerfiles/Dockerfile.lint)
+.PHONY: build_linter_image
 build_linter_image:
 	@docker build -q -t $(LINTER_IMAGE_NAME) -f ./dockerfiles/Dockerfile.lint .
 
 # build executable using a container
+.PHONY: build
 build: build_docker_image
 	@echo "WARNING: this will drop a Linux executable on your host (not a macOS of Windows one)"
 	@docker run --rm $(MOUNTS) $(DEV_DOCKER_IMAGE_NAME) make build
 
 # clean build artifacts using a container
+.PHONY: clean
 clean: build_docker_image
 	@docker run --rm $(MOUNTS) $(DEV_DOCKER_IMAGE_NAME) make clean
 
 # run go test
+.PHONY: test
 test: build_docker_image
 	@docker run --rm $(MOUNTS) $(DEV_DOCKER_IMAGE_NAME) make test
 
 # build the CLI for multiple architectures using a container
+.PHONY: cross
 cross: build_docker_image
 	@docker run --rm $(MOUNTS) $(DEV_DOCKER_IMAGE_NAME) make cross
 
 # start container in interactive mode for in-container development
+.PHONY: dev
 dev: build_docker_image
 	@docker run -ti $(MOUNTS) -v /var/run/docker.sock:/var/run/docker.sock $(DEV_DOCKER_IMAGE_NAME) ash
 
 # run linters in a container
+.PHONY: lint
 lint: build_linter_image
 	@docker run -ti $(MOUNTS) $(LINTER_IMAGE_NAME)
+
+# download dependencies (vendor/) listed in vendor.conf, using a container
+.PHONY: vendor
+vendor: build_docker_image vendor.conf
+	@docker run -ti --rm $(MOUNTS) $(DEV_DOCKER_IMAGE_NAME) make vendor