add modpack config to workspace (read-only via url)

ModpackUpdater.Apps.Manager/Api/Model/IWorkspace.cs

@@ -6,6 +6,8 @@ public interface IWorkspace
 {
     WorkspaceConfig Config { get; }
 
+    ModpackConfig? ModpackConfig { get; }
+
     InstallInfos? InstallInfos { get; }
 
     UpdateInfos? UpdateInfos { get; }

ModpackUpdater.Apps.Manager/Api/Model/WorkspaceConfig.cs

@@ -9,4 +9,6 @@ public abstract class WorkspaceConfig
 
     [JsonIgnore]
     public abstract string DisplayText { get; }
+
+    public string? ModpackConfigUrl { get; set; }
 }