Update User schema with a field required by teams migration

Author: aerosol

lib/plausible/auth/user.ex

@@ -47,6 +47,11 @@ defmodule Plausible.Auth.User do
     has_many :owner_memberships, Plausible.Teams.Membership, where: [role: :owner]
     has_many :owned_teams, through: [:owner_memberships, :team]
 
+    on_ce do
+      # we only need this for backfill teams migration to work; let's figure out how to safely remove later on
+      field :trial_expiry_date, :date
+    end
+
     timestamps()
   end