convert git repo for bazel dockers rules to artifiact
diff --git a/WORKSPACE b/WORKSPACE
index bcbbda3..0f2b4b1 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -784,10 +784,10 @@
 # end pex repos
 
 # for docker image building
-git_repository(
+http_archive(
     name = "io_bazel_rules_docker",
-    remote = "https://github.com/bazelbuild/rules_docker.git",
-    tag = "v0.3.0",
+    urls = ["https://github.com/bazelbuild/rules_docker/archive/v0.3.0.tar.gz"],
+    strip_prefix = "rules_docker-0.3.0",
 )
 
 load(