add GitHub as source & allow inheritance

ModpackUpdater.Model/InstallAction.cs

@@ -1,11 +1,38 @@
-namespace ModpackUpdater.Model;
+using Newtonsoft.Json;
+
+namespace ModpackUpdater.Model;
 
 public class InstallAction
 {
+    public string Name { get; set; }
+
+    public string InheritFrom { get; set; }
+
     public bool IsZip { get; set; }
+
     public string ZipPath { get; set; }
+
     public string DestPath { get; set; }
-    public string DownloadUrl { get; set; }
+
+    public string SourceUrl { get; set; }
+
+    public SourceType SourceType { get; set; }
+
+    public string SourceOwner { get; set; }
+
+    public string SourceName { get; set; }
+
+    public string SourceRegex { get; set; }
+
+    public string SourceTag { get; set; }
+
     public Side Side { get; set; } = Side.Both;
+
     public bool IsExtra { get; set; }
+
+    [JsonProperty, Obsolete]
+    private string DownloadUrl
+    {
+        set => SourceUrl = value;
+    }
 }

ModpackUpdater.Model/SourceType.cs

@@ -0,0 +1,7 @@
+namespace ModpackUpdater.Model;
+
+public enum SourceType
+{
+    DirectLink,
+    GitHub,
+}