Fix the script

docker/circle_docker_build.sh

@@ -4,10 +4,10 @@ set -ex
 CACHE_DIR=~/docker_cache
 if [ -e ${CACHE_DIR}/em-builder.tar ] && md5sum -c ${CACHE_DIR}/dockerfile.md5sum
 then
-  docker load < ~/${CACHE_DIR}/em-builder.tar
+  docker load < ${CACHE_DIR}/em-builder.tar
 else
   mkdir -p ${CACHE_DIR}
   docker build -t yuya-oc/em-builder docker
-  md5sum Dockerfile > ${CACHE_DIR}/dockerfile.md5sum
+  md5sum docker/Dockerfile > ${CACHE_DIR}/dockerfile.md5sum
   docker save yuya-oc/em-builder > ${CACHE_DIR}/em-builder.tar
 fi