Merge pull request #10713 from vsilvar/feature/10709-expose_IMvcBuilder_configuration_action

Exposed MVC configuration action in AddBackOffice - #10709

src/Umbraco.Web.BackOffice/DependencyInjection/UmbracoBuilderExtensions.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Linq;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
@@ -31,7 +32,7 @@ namespace Umbraco.Extensions
         /// <summary>
         /// Adds all required components to run the Umbraco back office
         /// </summary>
-        public static IUmbracoBuilder AddBackOffice(this IUmbracoBuilder builder) => builder
+        public static IUmbracoBuilder AddBackOffice(this IUmbracoBuilder builder, Action<IMvcBuilder> configureMvc = null) => builder
                 .AddConfiguration()
                 .AddUmbracoCore()
                 .AddWebComponents()
@@ -42,7 +43,7 @@ namespace Umbraco.Extensions
                 .AddMembersIdentity()
                 .AddBackOfficeAuthorizationPolicies()
                 .AddUmbracoProfiler()
-                .AddMvcAndRazor()
+                .AddMvcAndRazor(configureMvc)
                 .AddWebServer()
                 .AddPreviewSupport()
                 .AddHostedServices()