Add ruby tarball in prep for sandboxing

Change-Id: I585a836698dfbc5468f03d3105332513473be68e
diff --git a/debian/BUILD b/debian/BUILD
index 7ab6705..370c388 100644
--- a/debian/BUILD
+++ b/debian/BUILD
@@ -40,6 +40,10 @@
     ":python_gtk.bzl",
     python_gtk_debs = "files",
 )
+load(
+    ":ruby.bzl",
+    ruby_debs = "files",
+)
 load("//debian:packages.bzl", "download_packages", "generate_deb_tarball")
 
 filegroup(
@@ -118,6 +122,16 @@
 )
 
 download_packages(
+    name = "download_ruby_deps",
+    excludes = [
+        "ca-certificates",
+    ],
+    packages = [
+        "ruby",
+    ],
+)
+
+download_packages(
     name = "download_patch_deps",
     packages = [
         "patch",
@@ -261,3 +275,8 @@
     name = "python_gtk",
     files = python_gtk_debs,
 )
+
+generate_deb_tarball(
+    name = "ruby",
+    files = ruby_debs,
+)