Don't automatically craete the cache container.

Author: JimBobSquarePants

src/ImageSharp.Web.Providers.Azure/Caching/AzureBlobStorageCache.cs

@@ -3,6 +3,7 @@
 
 using System.IO;
 using System.Threading.Tasks;
+using Azure;
 using Azure.Storage.Blobs;
 using Azure.Storage.Blobs.Models;
 using Microsoft.Extensions.Options;
@@ -28,7 +29,6 @@ public AzureBlobStorageCache(IOptions<AzureBlobStorageCacheOptions> cacheOptions
             AzureBlobStorageCacheOptions options = cacheOptions.Value;
 
             this.container = new BlobContainerClient(options.ConnectionString, options.ContainerName);
-            this.container.CreateIfNotExistsAsync(PublicAccessType.None);
         }
 
         /// <inheritdoc/>
@@ -56,5 +56,30 @@ public Task SetAsync(string key, Stream stream, ImageCacheMetadata metadata)
 
             return blob.UploadAsync(stream, httpHeaders: headers, metadata: metadata.ToDictionary());
         }
+
+        /// <summary>
+        /// Creates a new container under the specified account if a container
+        /// with the same name does not already exist.
+        /// </summary>
+        /// <param name="options">The Azure Blob Storage cache options.</param>
+        /// <param name="accessType">
+        /// Optionally specifies whether data in the container may be accessed publicly and
+        /// the level of access. <see cref="PublicAccessType.BlobContainer"/>
+        /// specifies full public read access for container and blob data. Clients can enumerate
+        /// blobs within the container via anonymous request, but cannot enumerate containers
+        /// within the storage account. <see cref="PublicAccessType.Blob"/>
+        /// specifies public read access for blobs. Blob data within this container can be
+        /// read via anonymous request, but container data is not available. Clients cannot
+        /// enumerate blobs within the container via anonymous request. <see cref="PublicAccessType.None"/>
+        /// specifies that the container data is private to the account owner.
+        /// </param>
+        /// <returns>
+        /// If the container does not already exist, a <see cref="Response{T}"/> describing the newly
+        /// created container. If the container already exists, <see langword="null"/>.
+        /// </returns>
+        public static Response<BlobContainerInfo> CreateIfNotExists(
+            AzureBlobStorageCacheOptions options,
+            PublicAccessType accessType)
+            => new BlobContainerClient(options.ConnectionString, options.ContainerName).CreateIfNotExists(accessType);
     }
 }

src/ImageSharp.Web.Providers.Azure/Caching/AzureBlobStorageCacheOptions.cs

@@ -10,6 +10,7 @@ public class AzureBlobStorageCacheOptions
     {
         /// <summary>
         /// Gets or sets the Azure Blob Storage connection string.
+        /// <see href="https://docs.microsoft.com/en-us/azure/storage/common/storage-configure-connection-string."/>
         /// </summary>
         public string ConnectionString { get; set; }
 

src/ImageSharp.Web.Providers.Azure/Providers/AzureBlobStorageImageProviderOptions.cs

@@ -23,6 +23,7 @@ public class AzureBlobContainerClientOptions
     {
         /// <summary>
         /// Gets or sets the Azure Blob Storage connection string.
+        /// <see href="https://docs.microsoft.com/en-us/azure/storage/common/storage-configure-connection-string."/>
         /// </summary>
         public string ConnectionString { get; set; }
 

tests/ImageSharp.Web.Tests/TestUtilities/AzureBlobStorageCacheTestServerFixture.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Six Labors.
 // Licensed under the Apache License, Version 2.0.
 
+using Azure.Storage.Blobs.Models;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.Extensions.DependencyInjection;
 using SixLabors.ImageSharp.Web.Caching.Azure;
@@ -64,6 +65,8 @@ protected override void ConfigureServices(IServiceCollection services)
                 {
                     options.ConnectionString = TestConstants.AzureConnectionString;
                     options.ContainerName = TestConstants.AzureCacheContainerName;
+
+                    AzureBlobStorageCache.CreateIfNotExists(options, PublicAccessType.None);
                 })
                 .SetCache<AzureBlobStorageCache>();
         }