Add linux freedesktop category argument

src/Velopack.Build/PackTask.cs

@@ -88,6 +88,8 @@ public class PackTask : MSBuildAsyncTask
 
     public string? SignTemplate { get; set; }
 
+    public string? Categories { get; set; }
+
     protected override async Task<bool> ExecuteAsync()
     {
         //System.Diagnostics.Debugger.Launch();

src/Velopack.Build/Velopack.Build.targets

@@ -94,6 +94,7 @@
       SignSkipDll="$(VelopackSignSkipDll)"
       SignParallel="$(VelopackSignParallel)"
       SignTemplate="$(VelopackSignTemplate)"
+      Categories="$(VelopackCategories)"
     />
   </Target>
 

src/Velopack.Packaging.Unix/Commands/LinuxPackCommandRunner.cs

@@ -32,6 +32,9 @@ public class LinuxPackCommandRunner : PackageBuilder<LinuxPackOptions>
             var iconFilename = Options.PackId + Path.GetExtension(icon);
             File.Copy(icon, Path.Combine(dir.FullName, iconFilename), true);
 
+            var categories = String.IsNullOrWhiteSpace(Options.Categories) ? "" :
+                $"Categories={Options.Categories.TrimEnd(';')};";
+
             File.WriteAllText(appRunPath, $$"""
 #!/bin/sh
 
@@ -66,7 +69,7 @@ Comment={Options.PackTitle ?? Options.PackId} {Options.PackVersion}
 Icon={Options.PackId}
 Exec={mainExeName}
 StartupWMClass={Options.PackId}
-Categories=Development;
+{categories}
 """);
 
             // copy existing app files 

src/Velopack.Packaging.Unix/Commands/LinuxPackOptions.cs

@@ -35,4 +35,6 @@ public class LinuxPackOptions : IPackOptions
     public bool NoPortable { get; set; }
 
     public bool NoInst { get; set; }
+
+    public string Categories { get; set; }
 }

src/Velopack.Vpk/Commands/LinuxPackCommand.cs

@@ -4,12 +4,18 @@ public class LinuxPackCommand : PackCommand
 {
     public bool PackIsAppDir { get; private set; }
 
+    public string Categories { get; private set; }
+
     public LinuxPackCommand()
         : base("pack", "Create's a Linux .AppImage bundle from a folder containing application files.")
     {
         this.RemoveOption(NoPortableOption);
         this.RemoveOption(NoInstOption);
 
+        var categories = AddOption<string>((v) => Categories = v, "--categories")
+            .SetDescription("Categories from the freedesktop.org Desktop Menu spec")
+            .SetArgumentHelpName("NAMES");
+
         var appDir = AddOption<DirectoryInfo>((v) => {
             var t = v.ToFullNameOrNull();
             if (t != null) {
@@ -24,5 +30,6 @@ public class LinuxPackCommand : PackCommand
         this.AtLeastOneRequired(PackDirectoryOption, appDir);
         this.AreMutuallyExclusive(PackDirectoryOption, appDir);
         this.AreMutuallyExclusive(IconOption, appDir);
+        this.AreMutuallyExclusive(categories, appDir);
     }
 }