Opinionate the template, also some updates like the new build configs.

Content.Packaging/Content.Packaging.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\RobustToolbox\Robust.Packaging\Robust.Packaging.csproj" />
+  </ItemGroup>
+
+  <Import Project="..\RobustToolbox\MSBuild\Robust.Properties.targets" />
+</Project>

Content.Packaging/ContentPackaging.cs

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+using Robust.Packaging;
+using Robust.Packaging.AssetProcessing;
+
+namespace Content.Packaging;
+
+public static class ContentPackaging
+{
+    public static async Task WriteResources(
+        string contentDir,
+        AssetPass pass,
+        IPackageLogger logger,
+        CancellationToken cancel)
+    {
+        var graph = new RobustClientAssetGraph();
+        pass.Dependencies.Add(new AssetPassDependency(graph.Output.Name));
+
+        AssetGraph.CalculateGraph(graph.AllPasses.Append(pass).ToArray(), logger);
+
+        var inputPass = graph.Input;
+
+        await RobustClientPackaging.WriteContentAssemblies(
+            inputPass,
+            contentDir,
+            "Content.Client",
+            new[] { "Content.Client", "Content.Shared" },
+            cancel);
+
+        await RobustClientPackaging.WriteClientResources(contentDir, inputPass, cancel);
+
+        inputPass.InjectFinished();
+    }
+}

Content.Packaging/Program.cs

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+using System.Diagnostics;
+using System.IO.Compression;
+using Content.Packaging;
+using Robust.Packaging;
+using Robust.Packaging.AssetProcessing.Passes;
+using Robust.Packaging.Utility;
+using Robust.Shared.Timing;
+
+IPackageLogger logger = new PackageLoggerConsole();
+
+logger.Info("Clearing release/ directory");
+Directory.CreateDirectory("release");
+
+var skipBuild = args.Contains("--skip-build");
+
+if (!skipBuild)
+    WipeBin();
+
+await Build(skipBuild);
+
+async Task Build(bool skipBuild)
+{
+    logger.Info("Building project...");
+
+    if (!skipBuild)
+    {
+        await ProcessHelpers.RunCheck(new ProcessStartInfo
+        {
+            FileName = "dotnet",
+            ArgumentList =
+            {
+                "build",
+                Path.Combine("Content.Client", "Content.Client.csproj"),
+                "-c", "Release",
+                "--nologo",
+                "/v:m",
+                "/t:Rebuild",
+                "/p:FullRelease=true",
+                "/m"
+            }
+        });
+    }
+
+    logger.Info("Packaging client...");
+
+    var sw = RStopwatch.StartNew();
+
+    {
+        using var zipFile =
+            File.Open(Path.Combine("release", "SS14.Client.zip"), FileMode.Create, FileAccess.ReadWrite);
+        using var zip = new ZipArchive(zipFile, ZipArchiveMode.Update);
+        var writer = new AssetPassZipWriter(zip);
+
+        await ContentPackaging.WriteResources("", writer, logger, default);
+
+        await writer.FinishedTask;
+    }
+
+    logger.Info($"Finished packaging in {sw.Elapsed}");
+}
+
+
+void WipeBin()
+{
+    logger.Info("Clearing old build artifacts (if any)...");
+
+    Directory.Delete("bin", recursive: true);
+}