Admin page (#324)

* Updates based on documentation

* Getting the build passing

* Getting app functioning

* A few cleanups to confirm it's working as expected

* Fixing functional tests

* Updating dockerfile for 3.0

* Functional Tests now run sequentially

* Updating to latest version of moq

* Adding migration for post 3.0 upgrades

* Removing commented out lines

* Moving address and catalogitemordered configuration in to classes that own them

* Adding admin user

* Adding admin catalog screen

- will also only display menu option if user is logged in as an admin

* WIP - squash this

* Allow user to edit a catalog item

* Adding entry for new service

* Invalidating cache after catalog item update

- also a little bit of cleanup

* Fixing bad merge

* Removing Picture Uri and making Id readonly

* Adjusting style in menu dropdown so all options are shown

* Creating Cache helpers with unit tests

src/Web/Pages/Admin/EditCatalogItem.cshtml.cs

@@ -0,0 +1,39 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.eShopWeb.ApplicationCore.Constants;
+using Microsoft.eShopWeb.Web.Interfaces;
+using Microsoft.eShopWeb.Web.ViewModels;
+using System.Threading.Tasks;
+
+namespace Microsoft.eShopWeb.Web.Pages.Admin
+{
+    [Authorize(Roles = AuthorizationConstants.Roles.ADMINISTRATORS)]
+    public class EditCatalogItemModel : PageModel
+    {
+        private readonly ICatalogItemViewModelService _catalogItemViewModelService;
+
+        public EditCatalogItemModel(ICatalogItemViewModelService catalogItemViewModelService)
+        {
+            _catalogItemViewModelService = catalogItemViewModelService;
+        }
+
+        [BindProperty]
+        public CatalogItemViewModel CatalogModel { get; set; } = new CatalogItemViewModel();
+
+        public async Task OnGet(CatalogItemViewModel catalogModel)
+        {
+            CatalogModel = catalogModel;
+        }
+
+        public async Task<IActionResult> OnPostAsync()
+        {
+            if (ModelState.IsValid)
+            {
+                await _catalogItemViewModelService.UpdateCatalogItem(CatalogModel);
+            }
+
+            return RedirectToPage("/Admin/Index");
+        }
+    }
+}