Skip MapImages folder in packaging (#38928)

Content.Packaging/ClientPackaging.cs

@@ -78,7 +78,11 @@ public static class ClientPackaging
             new[] { "Content.Client", "Content.Shared", "Content.Shared.Database" },
             cancel: cancel);
 
-        await RobustClientPackaging.WriteClientResources(contentDir, inputPass, cancel);
+        await RobustClientPackaging.WriteClientResources(
+            contentDir,
+            inputPass,
+            SharedPackaging.AdditionalIgnoredResources,
+            cancel);
 
         inputPass.InjectFinished();
     }

Content.Packaging/ServerPackaging.cs

@@ -217,7 +217,11 @@ public static class ServerPackaging
             contentAssemblies,
             cancel: cancel);
 
-        await RobustServerPackaging.WriteServerResources(contentDir, inputPassResources, ServerContentIgnoresResources, cancel);
+        await RobustServerPackaging.WriteServerResources(
+            contentDir,
+            inputPassResources,
+            ServerContentIgnoresResources.Concat(SharedPackaging.AdditionalIgnoredResources).ToHashSet(),
+            cancel);
 
         if (hybridAcz)
         {

Content.Packaging/SharedPackaging.cs

@@ -0,0 +1,10 @@
+namespace Content.Packaging;
+
+public sealed class SharedPackaging
+{
+    public static readonly IReadOnlySet<string> AdditionalIgnoredResources = new HashSet<string>
+    {
+        // MapRenderer outputs into Resources. Avoid these getting included in packaging.
+        "MapImages",
+    };
+}