Move nostr pubkeys to LDAP attribute

closes #173

app/services/ldap_manager/update_nostr_key.rb

@@ -0,0 +1,16 @@
+module LdapManager
+  class UpdateNostrKey < LdapManagerService
+    def initialize(dn:, pubkey:)
+      @dn = dn
+      @pubkey = pubkey
+    end
+
+    def call
+      if @pubkey.present?
+        replace_attribute @dn, :nostrKey, @pubkey
+      else
+        delete_attribute @dn, :nostrKey
+      end
+    end
+  end
+end