From 6874fb1fccf1bac69f568983af9173f3219a9b8e Mon Sep 17 00:00:00 2001
From: Shunsuke Michii <harukasan@me.com>
Date: Mon, 1 Aug 2016 20:00:54 +0900
Subject: [PATCH] Add clean task for docker.

---
 Makefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 093febf..7345f41 100644
--- a/Makefile
+++ b/Makefile
@@ -28,10 +28,14 @@ docker-sh:
 docker-build:
 	docker build  -t go-libwebp .
 
+docker-clean:
+	docker rm $$(docker ps -a -q -f "ancestor=go-libwebp")
+
 .PHONY: \
 	all \
 	test \
 	docker-test \
 	docker-sh \
-	docker-build
+	docker-build \
+	docker-clean