puppet: Install camo on Docker.

Now that go-camo runs within supervisor, it can be run in Docker
simply.

Fixes #20101.
Fixes zulip/docker-zulip#179.

puppet/zulip/manifests/profile/docker.pp

@@ -5,6 +5,7 @@
 class zulip::profile::docker {
   include zulip::profile::base
   include zulip::profile::app_frontend
+  include zulip::localhost_camo
   include zulip::supervisor
   include zulip::process_fts_updates