Add temporary feed to boot-strap linux-musl build

Author: weshaggard

build/DependencyVersions.props

@@ -2,7 +2,7 @@
 <Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <MicrosoftAspNetCoreAppPackageVersion>2.1.0-preview2-30475</MicrosoftAspNetCoreAppPackageVersion>
-    <MicrosoftNETCoreAppPackageVersion>2.1.0-rc1-26419-02</MicrosoftNETCoreAppPackageVersion>
+    <MicrosoftNETCoreAppPackageVersion>2.1.0-rc1-26420-08</MicrosoftNETCoreAppPackageVersion>
     <MicrosoftNETCoreDotNetHostResolverPackageVersion>$(MicrosoftNETCoreAppPackageVersion)</MicrosoftNETCoreDotNetHostResolverPackageVersion>
     <MicrosoftBuildPackageVersion>15.7.0-preview-000169</MicrosoftBuildPackageVersion>
     <MicrosoftBuildFrameworkPackageVersion>$(MicrosoftBuildPackageVersion)</MicrosoftBuildFrameworkPackageVersion>

build/NugetConfigFile.targets

@@ -24,6 +24,7 @@
     <add key="nuget-build" value="https://dotnet.myget.org/F/nuget-build/api/v3/index.json" />
     <add key="api.nuget.org" value="https://api.nuget.org/v3/index.json" />
     <add key="container-tools" value="https://www.myget.org/F/container-tools-for-visual-studio/api/v3/index.json" />
+    <add key="linux-musl-bootstrap-feed" value="https://dotnetfeed.blob.core.windows.net/orchestrated-release-2-1/20180420-03/aspnet-inputs/index.json" />
         ]]>
       </NugetConfigCLIFeeds>