Add Annotations to all charts to ensure restarts on upgrade

Add appropriate annotations entry for all charts so that upgrades cause a restart of all affected services when configuration/secrets change.

Example:

spec:
  template:
    metadata:
      annotations:
        checksum/config: {{ .Files.Get "configmap.yml" | sha256sum }}

• omnibus
• registry
• nginx
• unicorn (already present, well done @twk3)