Adds load statement for @rules_proto

This is in preparation for --incompatible_load_proto_rules_from_bzl

Closes #8961.

PiperOrigin-RevId: 259931357
diff --git a/tools/BUILD b/tools/BUILD
index 65c85e2..479da90 100644
--- a/tools/BUILD
+++ b/tools/BUILD
@@ -85,3 +85,8 @@
     ],
     visibility = ["//src:__pkg__"],
 )
+
+sh_binary(
+    name = "upload_bazel_mirror",
+    srcs = ["upload_bazel_mirror.sh"],
+)