nixos/mailman: set RemainAfterExit for settings

This seems to be required to have the unit re-run if
services.mailman.restApiPassFile gets set.

Changed files
+1
nixos
modules
services
+1
nixos/modules/services/mail/mailman.nix
···
path = with pkgs; [ jq ];
after = optional withPostgresql "postgresql.service";
requires = optional withPostgresql "postgresql.service";
serviceConfig.Type = "oneshot";
script = ''
install -m0750 -o mailman -g mailman ${mailmanCfgFile} /etc/mailman.cfg
···
path = with pkgs; [ jq ];
after = optional withPostgresql "postgresql.service";
requires = optional withPostgresql "postgresql.service";
+
serviceConfig.RemainAfterExit = true;
serviceConfig.Type = "oneshot";
script = ''
install -m0750 -o mailman -g mailman ${mailmanCfgFile} /etc/mailman.cfg