[MIRROR] Fix ghost role free slot spawns (#11840)

Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>
Co-authored-by: C.L. <killer65311@gmail.com>

code/datums/ghost_spawn.dm

@@ -85,6 +85,9 @@ GLOBAL_VAR_INIT(allowed_ghost_spawns, 2)
 		if("lost_drone_spawn")
 			join_lost(ui.user)
 			. = TRUE
+		if("maintenance_critter")
+			join_maintrcritter(ui.user)
+			. = TRUE
 		if("gravekeeper_spawn")
 			join_grave(ui.user)
 			. = TRUE

code/datums/ghost_spawn_options.dm

@@ -209,7 +209,6 @@
 
 		gem.catch_mob(user) //This will result in us being deleted so...
 
-
 /datum/tgui_module/ghost_spawn_menu/proc/vore_belly_spawn(mob/observer/dead/user, selected_player)
 	var/mob/living/target = locate(selected_player) in GLOB.player_list
 
@@ -262,6 +261,25 @@
 	var/obj/structure/ghost_pod/manual/lost_drone/dogborg/lost = new(get_turf(spawnspot))
 	lost.create_occupant(user)
 
+/datum/tgui_module/ghost_spawn_menu/proc/join_maintrcritter(mob/observer/dead/user)
+	if(jobban_isbanned(user, JOB_GHOSTROLES))
+		to_chat(user, span_danger("You are banned from playing ghost roles and cannot spawn as a maint critter."))
+		return
+
+	if(GLOB.allowed_ghost_spawns <= 0)
+		to_chat(user, span_warning("There're no free ghost join slots."))
+		return
+
+	var/obj/effect/landmark/spawnspot = get_ghost_role_spawn()
+	if(!spawnspot)
+		to_chat(user, span_warning("No spawnpoint available."))
+		return
+
+	GLOB.allowed_ghost_spawns--
+	announce_ghost_joinleave(user, 0, "They are now a maint critter.")
+	var/obj/structure/ghost_pod/ghost_activated/unified_hole/maint_critter = new(get_turf(spawnspot))
+	maint_critter.create_occupant(user)
+
 /datum/tgui_module/ghost_spawn_menu/proc/join_grave(mob/observer/dead/user)
 	if(jobban_isbanned(user, JOB_CYBORG))
 		to_chat(user, span_danger("You are banned from playing synthetics and cannot spawn as a gravekeeper."))