move default variables to the correct location, per ansible variable …

…precedence

defaults/main.yml

@@ -1,2 +1,14 @@
 ---
-# defaults file for mailfruit
+# Set the below value to the commit ID or reference (ie 'master') of trees to checkout and compile
+# This is to gate when upstream breaks, which happens occasionally (as with all software)
+mailfruit_trees_git_ref: 'master'
+
+# Should you have something running on port 80 already, change this to a certbot
+# plugin that knows better what to do.
+mailfruit_certbot_authenticator: 'standalone'
+
+# The DKIM selector to use. This gets embedded in the DKIM signature in each outbound email,
+# and informs the receiving server what DNS record to query to check the signature.
+# A simple way to deploy this to multiple servers without syncing key material would be to
+# use a distinct value for this variable per-server and host each record independently.
+mailfruit_dkim_selector: 'mail'