What You Are Seeing?

Setting the SelfContained property for DotNetCorePublishSettings does not emit the respective parameter when executed by DotNetCorePublish:

 var settings = new DotNetCorePublishSettings
 {
     Framework = "netcoreapp2.0",
     Runtime = "win-x64",
     SelfContained = false, 
     Configuration = $"{configuration}",
     OutputDirectory = artifactsRootDir + "/dist"
 };

DotNetCorePublish("./src/" + appName + "/" + appName + ".csproj",settings);

What it produces at the command line:

Executing: "C:/Program Files/dotnet/dotnet.exe" publish "./src/ProjectName/ProjectName.csproj" --output "C:/projects/ProjectName/artifacts/debug/dist" --runtime win-x64 --framework netcoreapp2.0 --configuration debug

The --self-contained false parameter is missing. When --self-contained is omitted defaults to true when using --runtime.

https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-publish?tabs=netcore2x

This results in creating a self-contained publish.

What is Expected?

DotNetCorePublish to produce:

Executing: "C:/Program Files/dotnet/dotnet.exe" publish "./src/ProjectName/ProjectName.csproj" --output "C:/projects/ProjectName/artifacts/debug/dist" --runtime win-x64 --framework netcoreapp2.0 --configuration debug --self-contained false

What version of Cake are you using?

Version 0.26.1+Branch.main.Sha.b26790017b2befa7b35799eb9a0c1cba322b0c90

and

Version 0.27.1+Branch.main.Sha.7e44aa0319b6ef12ecc415d79a1c75cc98e2c788

Are you running on a 32 or 64 bit system?

x64

What environment are you running on? Windows? Linux? Mac?

Windows

Are you running on a CI Server? If so, which one?

Not yet.... just locally atm...

How Did You Get This To Happen? (Steps to Reproduce)

have a task to package .net core 2.0 command line app like below:

Task("Package")
	.Description("packages app")  
	.Does(() =>
{
     var settings = new DotNetCorePublishSettings
     {
         Framework = "netcoreapp2.0",
         Runtime = "win-x64",
         SelfContained = false,
         Configuration = $"{configuration}",
         OutputDirectory = artifactsRootDir + "/dist"
     };

    DotNetCorePublish("./src/" + appName + "/" + appName + ".csproj",settings);
});

Replace with the path to a sample .net core 2.0 command line application.

call via powershell .\build.ps1 -c debug -t package -verbosity diagnostic

Output Log

call via powershell .\build.ps1 -c debug -t package -verbosity diagnostic

Executing task: Package
Executing: "C:/Program Files/dotnet/dotnet.exe" publish "./src/ProjectName/ProjectName.csproj" --output "C:/projects/ProjectName/artifacts/debug/dist" --runtime win-x64 --framework netcoreapp2.0 --configuration debug
Microsoft (R) Build Engine version 15.6.84.34536 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

Restore completed in 49.21 ms for C:\projects\ProjectName\src\ProjectName\ProjectName.csproj.
ProjectName -> C:\projects\ProjectName\src\ProjectName\bin\debug\netcoreapp2.0\win-x64\ProjectName.dll
ProjectName -> C:\projects\ProjectName\artifacts\debug\dist
Finished executing task: Package