Remove build warnings

Author: ronaldbarendse

src/Umbraco.Cloud.StorageProviders.AzureBlob/AzureBlobComposer.cs

@@ -10,28 +10,29 @@ namespace Umbraco.Cloud.StorageProviders.AzureBlob
     /// Automatically configures Azure Blob Storage for use on Umbraco Cloud.
     /// </summary>
     /// <seealso cref="Umbraco.Cms.Core.Composing.IComposer" />
-    public class AzureBlobComposer : IComposer
+    public sealed class AzureBlobComposer : IComposer
     {
         /// <inheritdoc />
         public void Compose(IUmbracoBuilder builder)
         {
-            if (builder == null) throw new ArgumentNullException(nameof(builder));
+            ArgumentNullException.ThrowIfNull(builder);
 
-            /* There's a bug in Microsoft.Extensions.Configuration.EnvironmentVariables @ 6.0.0 WRT env var normalization + AddEnvironmentVariables(prefix) 
-             * See https://github.com/dotnet/runtime/pull/62916, should be resolved upstream in https://github.com/dotnet/runtime/milestone/87
-             * Until then, safest thing to do is explicitly add environment variables using both prefixes.
-             * (otherwise there are issues when folks update TFM to net6) */
             var configuration = new ConfigurationBuilder()
                 .AddEnvironmentVariables("Umbraco:Cloud:")
-                .AddEnvironmentVariables("Umbraco__Cloud__")
                 .Build();
 
             // Get options and manually validate (no need to add them to the service collection)
             var azureBlobOptions = configuration.GetSection("Storage:AzureBlob").Get<AzureBlobOptions>();
-            if (azureBlobOptions == null) return;
+            if (azureBlobOptions == null)
+            {
+                return;
+            }
 
             var validateResult = new DataAnnotationValidateOptions<AzureBlobOptions>(null).Validate(null, azureBlobOptions);
-            if (validateResult.Failed) return;
+            if (validateResult.Failed)
+            {
+                return;
+            }
 
             // Configure Azure Blob Storage
             builder.AddAzureBlobMediaFileSystem(options =>

src/Umbraco.Cloud.StorageProviders.AzureBlob/AzureBlobOptions.cs

@@ -1,11 +1,13 @@
 using System.ComponentModel.DataAnnotations;
+using System.Diagnostics.CodeAnalysis;
 
 namespace Umbraco.Cloud.StorageProviders.AzureBlob
 {
     /// <summary>
     /// The Azure Blob options used on Umbraco Cloud.
     /// </summary>
-    internal class AzureBlobOptions
+    [SuppressMessage("Performance", "CA1812:Avoid uninstantiated internal classes", Justification = "Used in configuration binding.")]
+    internal sealed class AzureBlobOptions
     {
         /// <summary>
         /// Gets or sets the endpoint.