Ensure HyperKitty is enabled.

states/mailman/etc/mailman-hyperkitty.cfg

@@ -19,4 +19,4 @@ base_url: http://lists.cryhavoc.org.uk/mailman3/hyperkitty/
 
 # The shared api_key, must be identical except for quoting to the value of
 # MAILMAN_ARCHIVER_KEY in HyperKitty's settings.
-api_key: '{{ pillar['mailman']['archiver_key'] }}'
+api_key: {{ pillar['mailman']['archiver_key'] }}

states/mailman/etc/mailman.cfg

@@ -270,3 +270,8 @@ lmtp_port: 8024
 # .cfg, which the file must end with.
 configuration: python:mailman.config.exim4
 #configuration: python:mailman.config.postfix
+
+[archiver.hyperkitty]
+class: mailman_hyperkitty.Archiver
+enable: yes
+configuration: /etc/mailman3/mailman-hyperkitty.cfg