Add ruby tarball in prep for sandboxing

Change-Id: I585a836698dfbc5468f03d3105332513473be68e
diff --git a/debian/ruby.BUILD b/debian/ruby.BUILD
new file mode 100644
index 0000000..73f9e4a
--- /dev/null
+++ b/debian/ruby.BUILD
@@ -0,0 +1,9 @@
+filegroup(
+    name = "ruby",
+    srcs = glob(
+        [
+            "usr/**",
+        ],
+    ),
+    visibility = ["//visibility:public"],
+)