Use fallback blob provider type.

Co-authored-by: Cursor <cursoragent@cursor.com>

framework/src/Volo.Abp.BlobStoring/Volo/Abp/BlobStoring/BlobContainerConfiguration.cs

@@ -7,10 +7,16 @@ namespace Volo.Abp.BlobStoring;
 
 public class BlobContainerConfiguration
 {
+    private Type? _providerType;
+
     /// <summary>
     /// The provider to be used to store BLOBs of this container.
     /// </summary>
-    public Type? ProviderType { get; set; }
+    public Type? ProviderType
+    {
+        get => _providerType ?? _fallbackConfiguration?.ProviderType;
+        set => _providerType = value;
+    }
 
     /// <summary>
     /// Indicates whether this container is multi-tenant or not.

framework/test/Volo.Abp.BlobStoring.Tests/Volo/Abp/BlobStoring/AbpBlobStoringOptions_Tests.cs

@@ -33,6 +33,7 @@ public class AbpBlobStoringOptions_Tests : AbpBlobStoringTestBase
     {
         var config = _configurationProvider.Get<TestContainer3>();
         config.ProviderType.ShouldBe(typeof(FakeBlobProvider1));
+        config.IsMultiTenant.ShouldBeFalse();
         config.GetConfigurationOrNull("TestConfigDefault").ShouldBe("TestValueDefault");
     }
 }

framework/test/Volo.Abp.BlobStoring.Tests/Volo/Abp/BlobStoring/AbpBlobStoringTestModule.cs

@@ -36,6 +36,10 @@ public class AbpBlobStoringTestModule : AbpModule
                 {
                     container.SetConfiguration("TestConfig2", "TestValue2");
                     container.ProviderType = typeof(FakeBlobProvider2);
+                })
+                .Configure<TestContainer3>(container =>
+                {
+                    container.IsMultiTenant = false;
                 });
         });
     }