Add missing add_foreign_key for packages

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

db/schema.rb

@@ -3123,6 +3123,7 @@ ActiveRecord::Schema.define(version: 20180810155213) do
   add_foreign_key "oauth_openid_requests", "oauth_access_grants", column: "access_grant_id", name: "fk_oauth_openid_requests_oauth_access_grants_access_grant_id"
   add_foreign_key "packages_maven_metadata", "packages_packages", column: "package_id", name: "fk_be88aed360", on_delete: :cascade
   add_foreign_key "packages_package_files", "packages_packages", column: "package_id", name: "fk_86f0f182f8", on_delete: :cascade
+  add_foreign_key "packages_packages", "projects", on_delete: :cascade
   add_foreign_key "pages_domains", "projects", name: "fk_ea2f6dfc6f", on_delete: :cascade
   add_foreign_key "path_locks", "projects", name: "fk_5265c98f24", on_delete: :cascade
   add_foreign_key "path_locks", "users"