Bump version of "io_bazel_rules_docker"

This presumably enables build on bazel 4.0.0 outside of nix install

Change-Id: I5acab20a20bc0fb63f20208a86c573529ce65c75
diff --git a/WORKSPACE b/WORKSPACE
index fb81739..5c987ff 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -104,9 +104,9 @@
 
 http_archive(
     name = "io_bazel_rules_docker",
-    sha256 = "1698624e878b0607052ae6131aa216d45ebb63871ec497f26c67455b34119c80",
-    strip_prefix = "rules_docker-0.15.0",
-    urls = ["https://github.com/bazelbuild/rules_docker/releases/download/v0.15.0/rules_docker-v0.15.0.tar.gz"],
+    sha256 = "59d5b42ac315e7eadffa944e86e90c2990110a1c8075f1cd145f487e999d22b3",
+    strip_prefix = "rules_docker-0.17.0",
+    urls = ["https://github.com/bazelbuild/rules_docker/releases/download/v0.17.0/rules_docker-v0.17.0.tar.gz"],
 )
 
 load("@io_bazel_rules_docker//toolchains/docker:toolchain.bzl", docker_toolchain_configure = "toolchain_configure")