Work around dotnet publish bug

Author: andyleejordan

PowerShellEditorServices.build.ps1

@@ -107,8 +107,8 @@ task SetupDotNet -Before Clean, Build, TestServerWinPS, TestServerPS7, TestServe
     $dotnetExePath = if ($script:IsNix) { "$dotnetPath/dotnet" } else { "$dotnetPath/dotnet.exe" }
 
     if (!(Test-Path $dotnetExePath)) {
-        # TODO: Test .NET 5 with PowerShell 7.1, and add that channel here.
-        Install-Dotnet -Channel '3.1','release/6.0.1xx-preview2'
+        # TODO: Test .NET 5 with PowerShell 7.1
+        Install-Dotnet -Channel '3.1','5.0','6.0'
     }
 
     # This variable is used internally by 'dotnet' to know where it's installed
@@ -351,6 +351,10 @@ task LayoutModule -After Build {
                 Copy-Item -Path $hostComponent.FullName -Destination $psesDeskHostPath -Force
             }
         }
+
+        # HACK: This is a temporary workaround of `dotnet publish`
+        Write-Warning "Working around dotnet publish bug!"
+        Copy-Item -Path $script:HostDeskOutput/../netstandard.dll -Destination $psesDeskHostPath -Force
     }
 
     # Assemble the PowerShellEditorServices.VSCode module