Mineshaft (#25733)

* content

* catwalks

* fix fucking icons

* finish PR

* +1 room

* fix

Content.Shared/Procedural/PostGeneration/CorridorPostGen.cs

@@ -1,3 +1,6 @@
+using Content.Shared.Maps;
+using Robust.Shared.Prototypes;
+
 namespace Content.Shared.Procedural.PostGeneration;
 
 /// <summary>
@@ -17,6 +20,9 @@ public sealed partial class CorridorPostGen : IPostDunGen
     [DataField("method")]
     public CorridorPostGenMethod Method = CorridorPostGenMethod.MinimumSpanningTree;
 
+    [DataField]
+    public ProtoId<ContentTileDefinition> Tile = "FloorSteel";
+
     /// <summary>
     /// How wide to make the corridor.
     /// </summary>