Fix: added late extension (coscine/issues#725)

src/ApiCommons/AbstractStartup.cs

@@ -30,6 +30,11 @@ namespace Coscine.ApiCommons
 
         }
 
+        public virtual void ConfigureServicesExtensionLate(IServiceCollection services)
+        {
+
+        }
+
         public void ConfigureServices(IServiceCollection services)
         {
             ConfigureServicesExtension(services);
@@ -55,6 +60,8 @@ namespace Coscine.ApiCommons
                     ValidateAudience = false
                 };
             });
+
+            ConfigureServicesExtensionLate(services);
         }
 
         public virtual void ConfigureExtension(IApplicationBuilder app, IHostingEnvironment env)
@@ -62,6 +69,11 @@ namespace Coscine.ApiCommons
 
         }
 
+        public virtual void ConfigureExtensionLate(IApplicationBuilder app, IHostingEnvironment env)
+        {
+
+        }
+
         public void Configure(IApplicationBuilder app, IHostingEnvironment env)
         {
             ConfigureExtension(app, env);
@@ -90,6 +102,8 @@ namespace Coscine.ApiCommons
             });
 
             DataConnection.DefaultSettings = new CoscineSettings(_configuration);
+
+            ConfigureExtensionLate(app, env);
         }
     }
 }