Tech storage now includes a small kit of relevant supplies for custom shuttles (#90468)

## About The Pull Request

This adds a techstorage spawner for a set of custom shuttle supplies
consisting of:

The shuttle navigation and shuttle docking boards
50 shuttle lattice rods
Four boards for propulsion engines
A blank shuttle blueprint

As well, each tech storage has had a rack with this spawner added to it.
## Why It's Good For The Game

As tech storage includes many boards that aren't available otherwise
without research or cargo, the same applies to custom shuttle boards and
supplies. This makes one set of these supplies available roundstart to
anyone who can manage to get tech storage access.
## Changelog
🆑 Bisar
add: NanoTrasen reminds all employees that it assumes no liability for
any activities carried out when not on the premises of a Nanotrasen
colony, station, or bluespace pocket. Any employees electing to leave
the premises during their break are reminded that it is imperative that
they clock out, as per their contract.
add: Tech storage now includes a small set of custom shuttle supplies.
/🆑

code/game/objects/effects/spawners/random/techstorage.dm

@@ -24,6 +24,19 @@
 		/obj/item/circuitboard/computer/arcade/orion_trail,
 	)
 
+/obj/effect/spawner/random/techstorage/custom_shuttle
+	name = "custom shuttle circuit board spawner"
+	loot = list(
+		/obj/item/circuitboard/computer/shuttle/docker,
+		/obj/item/circuitboard/computer/shuttle/flight_control,
+		/obj/item/circuitboard/machine/engine/propulsion,
+		/obj/item/circuitboard/machine/engine/propulsion,
+		/obj/item/circuitboard/machine/engine/propulsion,
+		/obj/item/circuitboard/machine/engine/propulsion,
+		/obj/item/shuttle_blueprints,
+		/obj/item/stack/rods/shuttle/fifty,
+	)
+
 /obj/effect/spawner/random/techstorage/service_all
 	name = "service circuit board spawner"
 	loot = list(