Add BuildAtProductionType to boats/subs.

mods/ra/rules/ships.yaml

@@ -2,6 +2,7 @@ SS:
 	Inherits: ^Ship
 	Buildable:
 		Queue: Ship
+		BuildAtProductionType: Submarine
 		BuildPaletteOrder: 30
 		Prerequisites: ~spen, ~techlevel.medium
 		Hotkey: u
@@ -54,6 +55,7 @@ MSUB:
 	Inherits: ^Ship
 	Buildable:
 		Queue: Ship
+		BuildAtProductionType: Submarine
 		BuildPaletteOrder: 60
 		Prerequisites: ~spen, stek, ~techlevel.unrestricted
 		Hotkey: m
@@ -106,6 +108,7 @@ DD:
 	Inherits: ^Ship
 	Buildable:
 		Queue: Ship
+		BuildAtProductionType: Boat
 		BuildPaletteOrder: 40
 		Prerequisites: ~syrd, dome, ~techlevel.medium
 		Hotkey: r
@@ -155,6 +158,7 @@ CA:
 	Inherits: ^Ship
 	Buildable:
 		Queue: Ship
+		BuildAtProductionType: Boat
 		BuildPaletteOrder: 50
 		Prerequisites: ~syrd, atek, ~techlevel.unrestricted
 		Hotkey: c
@@ -249,6 +253,7 @@ PT:
 	Inherits: ^Ship
 	Buildable:
 		Queue: Ship
+		BuildAtProductionType: Boat
 		BuildPaletteOrder: 20
 		Prerequisites: ~syrd, ~techlevel.medium
 		Hotkey: b

mods/ra/rules/structures.yaml

@@ -127,7 +127,7 @@ SPEN:
 		Facing: 224
 		ExitCell: 2,0
 	Production:
-		Produces: Ship
+		Produces: Ship, Submarine
 	PrimaryBuilding:
 	IronCurtainable:
 	-EmitInfantryOnSell:
@@ -183,7 +183,7 @@ SYRD:
 		Facing: 32
 		ExitCell: 2,0
 	Production:
-		Produces: Ship
+		Produces: Ship, Boat
 	PrimaryBuilding:
 	IronCurtainable:
 	-EmitInfantryOnSell: