build/Icon.props

<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  
  <PropertyGroup>
    <PackageIcon>icon.png</PackageIcon>
    <PackageIconUrl>https://aka.ms/azure-functions-package-icon</PackageIconUrl>
  </PropertyGroup>

  <ItemGroup>
    <None Include="$(MSBuildThisFileDirectory)/icon.png" Pack="true" PackagePath="/">
      <Visible>false</Visible>
    </None>
  </ItemGroup>

</Project>