Update dependencies from https://github.com/dotnet/arcade build 908 (#4887)

This change updates the following dependencies
- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.18619.4

eng/Version.Details.xml

@@ -2,9 +2,9 @@
 <Dependencies>
   <ProductDependencies></ProductDependencies>
   <ToolsetDependencies>
-    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="1.0.0-beta.18618.7">
+    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="1.0.0-beta.18619.4">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>090315e5d933cba3798abbfaa43e49e2245d6b35</Sha>
+      <Sha>7d79a676328f2bdd8b14bfee7fac6dad23123fad</Sha>
     </Dependency>
   </ToolsetDependencies>
 </Dependencies>

eng/common/PublishToPackageFeed.proj

@@ -0,0 +1,37 @@
+<!--
+  This MSBuild file is intended to be used as the body of the default 
+  publishing release pipeline. The release pipeline will use this file
+  to invoke the PushToStaticFeed task that will read the build asset
+  manifest and publish the assets described in the manifest to
+  informed target feeds.
+-->
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+  </PropertyGroup>
+
+  <Import Project="$(MSBuildThisFileDirectory)MicrosoftDotNetBuildTasksFeedVersion.props" />
+  <Import Project="$(NuGetPackageRoot)microsoft.dotnet.build.tasks.feed\$(MicrosoftDotNetBuildTasksFeedVersion)\build\Microsoft.DotNet.Build.Tasks.Feed.targets" />
+
+  <Target Name="PublishToFeed">
+    <Error Condition="'$(TargetStaticFeed)' == ''" Text="TargetStaticFeed: Target feed for publishing assets wasn't provided." />
+    <Error Condition="'$(AccountKeyToStaticFeed)' == ''" Text="AccountKeyToStaticFeed: Account key for target feed wasn't provided." />
+    <Error Condition="'$(FullPathAssetManifest)' == ''" Text="Full path to asset manifest wasn't provided." />
+    <Error Condition="'$(FullPathBlobBasePath)' == '' AND '$(FullPathPackageBasePath)' == ''" Text="A valid full path to BlobBasePath of PackageBasePath is required." />
+
+    <PushArtifactsInManifestToFeed
+      ExpectedFeedUrl="$(TargetStaticFeed)"
+      AccountKey="$(AccountKeyToStaticFeed)"
+      Overwrite="$(OverrideAssetsWithSameName)"
+      PassIfExistingItemIdentical="$(PassIfExistingItemIdentical)"
+      MaxClients="$(MaxParallelUploads)"
+      UploadTimeoutInMinutes="$(MaxUploadTimeoutInMinutes)"
+      AssetManifestPath="$(FullPathAssetManifest)"
+      BlobAssetsBasePath="$(FullPathBlobBasePath)"
+      PackageAssetsBasePath="$(FullPathPackageBasePath)" />
+  </Target>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.DotNet.Build.Tasks.Feed" Version="$(MicrosoftDotNetBuildTasksFeedVersion)" />
+  </ItemGroup>
+</Project>

eng/common/build.ps1

@@ -80,7 +80,11 @@ function Build {
   $bl = if ($binaryLog) { "/bl:" + (Join-Path $LogDir "Build.binlog") } else { "" }
 
   if ($projects) {
-    $properties += "/p:Projects=$projects"
+    # Re-assign properties to a new variable because PowerShell doesn't let us append properties directly for unclear reasons.
+    # Explicitly set the type as string[] because otherwise PowerShell would make this char[] if $properties is empty.
+    [string[]] $msbuildArgs = $properties
+    $msbuildArgs += "/p:Projects=$projects"
+    $properties = $msbuildArgs
   }
 
   MSBuild $toolsetBuildProj `

global.json

@@ -3,6 +3,6 @@
     "dotnet": "2.1.300"
   },
   "msbuild-sdks": {
-    "Microsoft.DotNet.Arcade.Sdk": "1.0.0-beta.18618.7"
+    "Microsoft.DotNet.Arcade.Sdk": "1.0.0-beta.18619.4"
   }
 }