Skip tests based on Category instead of ifdef DEBUG

Tapeti.Tests/Client/TapetiClientTests.cs

@@ -1,6 +1,4 @@
-// Do not include in the Release build for AppVeyor due to the Docker requirement
-#if DEBUG
-using System.Text;
+using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using FluentAssertions;
@@ -14,6 +12,7 @@ using Xunit.Abstractions;
 namespace Tapeti.Tests.Client
 {
     [Collection(RabbitMQCollection.Name)]
+    [Trait("Category", "Requires Docker")]
     public class TapetiClientTests : IAsyncLifetime
     {
         private readonly RabbitMQFixture fixture;
@@ -115,4 +114,3 @@ namespace Tapeti.Tests.Client
         }
     }
 }
-#endif

appveyor.yml

@@ -32,6 +32,14 @@ after_build:
 build:
   project: Tapeti.sln
 
+test:
+  assemblies:
+    only:
+      - Tapeti.Tests\bin\Release\net6.0\Tapeti.Tests.dll
+  categories:
+    except:
+      - Requires Docker
+
 platform:
   - Any CPU