Improve pack-weaver task to auto-delete old package.

Updated comments.

Author: timcassell

build/BenchmarkDotNet.Build/Runners/BuildRunner.cs

@@ -8,6 +8,7 @@
 using Cake.Common.Tools.DotNet.Workload.Install;
 using Cake.Core;
 using Cake.Core.IO;
+using System.IO;
 using System.Linq;
 
 namespace BenchmarkDotNet.Build.Runners;
@@ -24,6 +25,13 @@ public BuildRunner(BuildContext context)
     public void PackWeaver()
     {
         var weaverPath = context.AllPackableSrcProjects.Single(p => p.GetFilename() == "BenchmarkDotNet.Weaver.csproj");
+        var outputPackageDir = weaverPath.GetDirectory().Combine("packages");
+
+        // Delete old package.
+        foreach (var file in Directory.EnumerateFiles(outputPackageDir.FullPath))
+        {
+            File.Delete(file);
+        }
 
         context.DotNetRestore(weaverPath.GetDirectory().FullPath,
             new DotNetRestoreSettings
@@ -43,7 +51,7 @@ public void PackWeaver()
 
         context.DotNetPack(weaverPath.FullPath, new DotNetPackSettings
         {
-            OutputDirectory = weaverPath.GetDirectory().Combine("packages"),
+            OutputDirectory = outputPackageDir,
             MSBuildSettings = context.MsBuildSettingsPack,
             Configuration = context.BuildConfiguration
         });

src/BenchmarkDotNet.Weaver/BenchmarkDotNet.Weaver.csproj

@@ -1,5 +1,7 @@
-<!-- When any changes are made to this project, increment the WeaverVersionSuffix in the common.props file,
-     then re-pack with output to \packages, and delete the old nupkg. -->
+<!--
+If any changes are made to this project, increment the WeaverVersionSuffix in the common.props file,
+then run `build.cmd pack-weaver`.
+-->
 
 <Project Sdk="Microsoft.NET.Sdk">
   <Import Project="..\..\build\common.props" />

src/BenchmarkDotNet.Weaver/src/WeaveAssemblyTask.cs

@@ -1,3 +1,8 @@
+// *****
+// If any changes are made to this file, increment the WeaverVersionSuffix in the common.props file,
+// then run `build.cmd pack-weaver`.
+// *****
+
 using AsmResolver.DotNet;
 using AsmResolver.PE.DotNet.Metadata.Tables.Rows;
 using Microsoft.Build.Framework;