add missing internal rules

BUILD

diff --git a/BUILD b/BUILD
index 9e1ee65..1f6a0cf 100644
--- a/BUILD
+++ b/BUILD
@@ -5,7 +5,9 @@
 filegroup(
     name = "distribution",
     srcs = glob([
+        "BUILD",
         "LICENSE",
+        "*.bzl",
     ]),
     visibility = ["@//distro:__pkg__"],
 )