Point Verdant now only spawns when today is a Port of Call (#18670)

* Port of Call Template Flag

* oops

* bitflags

* bitflags but frfr

* I give up + fix

* bitflags again again

* Port of Call Day changes

* remove Horizon check

* small thing :)

* check day directly now

* new proc to check port of call, and possible fix

* Requested Changes

* requested gem changes

* gem gaming

* gemmmmmmmmmmmmmmmmmmmmmmmmmmm

---------

Co-authored-by: Benedict <Ben10083@users.noreply.github.com>

code/modules/maps/ruins.dm

@@ -41,6 +41,17 @@ GLOBAL_LIST_EMPTY(banned_ruin_ids)
 			handled_ruin_paths += ruin.type
 			continue
 
+		if((ruin.template_flags & TEMPLATE_FLAG_PORT_SPAWN))
+			if(SSatlas.is_port_call_day())
+				force_spawn |= ruin
+				for(var/ruin_path in ruin.force_ruins)
+					var/datum/map_template/ruin/force_ruin = new ruin_path
+					force_spawn |= force_ruin
+			// No matter if it spawns or not, we want it removed from further consideration, it either spawns here or not at all
+			potentialRuins -= ruin
+			handled_ruin_paths += ruin.type
+			continue
+
 		available[ruin] = ruin.spawn_weight
 
 		for(var/ruin_path in ruin.allow_ruins)