ASP.NET Core build on different platforms - asp.net

Question

I created a simple ASP.NET Core application and I want to build it on Windows 10 for Windows 10 and CentOS 7. So my I have this in my project.json file:
"runtimes": {
"win10-x64": { },
"centos.7-x64": { },
"win81-x64": { }
},
Without "win81-x64" I got an error:
Can not find runtime target for framework '.NETCoreApp,Version=v1.0' compatible with one of the target runtimes: 'win81-x64, win8-x64, win7-x64'
After dotnet build command i see this:
Project ListService (.NETCoreApp,Version=v1.0) will be compiled because expected outputs are missing Compiling ListService for .NETCoreApp,Version=v1.0
Compilation succeeded.
0 Warning(s)
0 Error(s)
Time elapsed 00:00:14.3853704
And command dotnet --info shows:
Product Information:
Version: 1.0.0-preview2-003131
Commit SHA-1 hash: 635cf40e58
Runtime Environment:
OS Name: Windows
OS Version: 6.3.9600
OS Platform: Windows
RID: win81-x64
Am I missing something? Also the dotnet publish -r foo-version did not helped.
{
"dependencies": {
"Microsoft.NETCore.App": {
"version": "1.0.1"
},
"Microsoft.ApplicationInsights.AspNetCore": "1.0.0",
"Microsoft.AspNetCore.Mvc": "1.0.1",
"Microsoft.AspNetCore.Routing": "1.0.1",
"Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
"Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
"Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
"Microsoft.Extensions.Configuration.FileExtensions": "1.0.0",
"Microsoft.Extensions.Configuration.Json": "1.0.0",
"Microsoft.Extensions.Logging": "1.0.0",
"Microsoft.Extensions.Logging.Console": "1.0.0",
"Microsoft.Extensions.Logging.Debug": "1.0.0",
"Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0"
},
"tools": {
"Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
},
"runtimes": {
"win10-x64": { },
"centos.7-x64": { },
"win81-x64": { }
},
"frameworks": {
"netcoreapp1.0": {
"imports": [
"dotnet5.6",
"portable-net45+win8"
]
}
},
"buildOptions": {
"emitEntryPoint": true,
"preserveCompilationContext": true
},
"runtimeOptions": {
"configProperties": {
"System.GC.Server": true
}
},
"publishOptions": {
"include": [
"wwwroot",
"**/*.cshtml",
"appsettings.json",
"web.config"
]
},
"scripts": {
"postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
}
}

Answer 1

Ok so now it works.
What I did was:
I removed "type":"platform" from project.json file
I ran command dotnet build -r centos.7-x64 in cmd from project folder
And now i see