Set default cadences automatic to false

As the default cadences are defined behind the scenes we do not
need to set these to automatic, this decision should be made by
the user. We will default to automatic once we expose cadences to
the user as that is when user can decide to change it.

db/post_migrate/20210317104032_set_iteration_cadence_automatic_to_false.rb

+# frozen_string_literal: true
+
+class SetIterationCadenceAutomaticToFalse < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def up
+    ActiveRecord::Base.connection.execute <<~SQL
+      UPDATE iterations_cadences
+      SET automatic = FALSE
+      WHERE iterations_cadences.automatic = TRUE
+    SQL
+  end
+
+  def down
+    #  no-op
+  end
+end

db/schema_migrations/20210317104032

+c954e1f2bfdfddc98030bfa0ab28f58a41921cbb5b81e088cde12637e3ae5a8f
\ No newline at end of file

ee/app/models/ee/iteration.rb

@@ -211,6 +211,7 @@ module EE
       ::Iterations::Cadence.create_with(
         title: cadence_title,
         start_date: start_date,
+        automatic: false,
         # set to 0, i.e. unspecified when creating default iterations as we do validate for presence.
         iterations_in_advance: 0,
         duration_in_weeks: 0

ee/changelogs/unreleased/automate-iteration-creation-per-cadence.yml

+---
+title: Set default cadences to non-automatic
+merge_request: 56842
+author:
+type: fixed