Prevent Delivery API output cache configuration from affecting other controllers (#17405)

Co-authored-by: Elitsa <[email protected]>

Author: kjac

src/Umbraco.Cms.Api.Delivery/Caching/NoOutputCachePolicy.cs

@@ -0,0 +1,19 @@
+using Microsoft.AspNetCore.OutputCaching;
+
+namespace Umbraco.Cms.Api.Delivery.Caching;
+
+internal sealed class NoOutputCachePolicy : IOutputCachePolicy
+{
+    ValueTask IOutputCachePolicy.CacheRequestAsync(OutputCacheContext context, CancellationToken cancellationToken)
+    {
+        context.EnableOutputCaching = false;
+
+        return ValueTask.CompletedTask;
+    }
+
+    ValueTask IOutputCachePolicy.ServeFromCacheAsync(OutputCacheContext context, CancellationToken cancellationToken)
+        => ValueTask.CompletedTask;
+
+    ValueTask IOutputCachePolicy.ServeResponseAsync(OutputCacheContext context, CancellationToken cancellationToken)
+        => ValueTask.CompletedTask;
+}

src/Umbraco.Cms.Api.Delivery/DependencyInjection/UmbracoBuilderExtensions.cs

@@ -105,7 +105,7 @@ private static IUmbracoBuilder AddOutputCache(this IUmbracoBuilder builder)
 
         builder.Services.AddOutputCache(options =>
         {
-            options.AddBasePolicy(_ => { });
+            options.AddBasePolicy(build => build.AddPolicy<NoOutputCachePolicy>());
 
             if (outputCacheSettings.ContentDuration.TotalSeconds > 0)
             {