Add unlock_membership_to_ldap boolean to Groups

What does this MR do?

This MR adds a boolean attribute to groups (namespaces table) to check if owners are allowed to add members outside the LDAP group setup !26520 (merged)

Migration

ALTER TABLE namespaces ADD COLUMN unlock_membership_to_ldap BOOLEAN

Duration: 17.000 ms

Output of rollback and migration

$ rails db:migrate:redo VERSION=20200304124406 
== 20200304124406 AddUnlockMembershipToLdapOfGroups: reverting ================
-- remove_column(:namespaces, :unlock_membership_to_ldap)
   -> 0.0009s
== 20200304124406 AddUnlockMembershipToLdapOfGroups: reverted (0.0057s) =======

== 20200304124406 AddUnlockMembershipToLdapOfGroups: migrating ================
-- add_column(:namespaces, :unlock_membership_to_ldap, :boolean)
   -> 0.0005s
== 20200304124406 AddUnlockMembershipToLdapOfGroups: migrated (0.0014s) =======

As it is without default values, it should be safe and downtime shouldn't be required

Conformity

• Changelog entry
• Database guides

Related to #1793 and !26520 (merged)