Adds metal shelf recipe (#25468)

* adds metal shelf recipe

* 2 iron to 1 because it deconstructs into rack parts

modular_skyrat/master_files/code/game/objects/items/stacks/sheets/sheet_types.dm

@@ -26,6 +26,7 @@ GLOBAL_LIST_INIT(skyrat_metal_recipes, list(
 	new/datum/stack_recipe("elevated floor tile", /obj/item/stack/tile/iron/elevated, 1, 4, 20, check_density = FALSE, category = CAT_TILES),
 	new/datum/stack_recipe("wrestling turnbuckle", /obj/structure/wrestling_corner, 3, time = 2.5 SECONDS, one_per_turf = TRUE, on_solid_ground = TRUE, category = CAT_STRUCTURE),
 	new/datum/stack_recipe("metal barricade", /obj/structure/deployable_barricade/metal, 2, time = 1 SECONDS, on_solid_ground = TRUE, check_direction = TRUE, category = CAT_STRUCTURE),
+	new/datum/stack_recipe("metal shelf", /obj/structure/rack/shelf, 1, time = 2 SECONDS, one_per_turf = TRUE, on_solid_ground = FALSE, category = CAT_STRUCTURE),
 	new/datum/stack_recipe("anvil", /obj/structure/reagent_anvil, 10, time = 2 SECONDS, one_per_turf = TRUE, on_solid_ground = TRUE, category = CAT_TOOLS),
 	new/datum/stack_recipe("forge", /obj/structure/reagent_forge, 10, time = 2 SECONDS, one_per_turf = TRUE, on_solid_ground = TRUE, category = CAT_TOOLS),
 	new/datum/stack_recipe("throwing wheel", /obj/structure/throwing_wheel, 10, time = 2 SECONDS, one_per_turf = TRUE, on_solid_ground = TRUE, category = CAT_TOOLS),