Allow hosts to start with wildcards

Helm fails to parse YAML values if they start with *. See this discussion. The error message is error converting YAML to JSON: yaml: line 19: did not find expected alphabetic or numeric character.

To allow for hosts starting with wildcards, e.g. *.myapp.com, we need to wrap this value between quotes, so Helm knows how to parse it.

Users that want to set their ADDITIONAL_HOSTS with wildcards have a workaround. They can set it in the UI field including the quotes. ADDITIONAL_HOSTS: '*.myap.com'.

Although we should have this quotes by default in our templates, since we know hosts are always strings, not numbers.