fix: dockerfile detector detector class type (#181)

Author: JamieMagee

src/Microsoft.ComponentDetection.Contracts/DetectorClass.cs

@@ -41,5 +41,8 @@ public enum DetectorClass
 
         /// <summary>Indicates a detector applies to Vcpkg packages.</summary>
         Vcpkg,
+
+        /// <summary>Indicates a detector applies to Docker references.</summary>
+        DockerReference,
     }
 }

src/Microsoft.ComponentDetection.Detectors/dockerfile/DockerfileComponentDetector.cs

@@ -24,7 +24,7 @@ public class DockerfileComponentDetector : FileComponentDetector, IDefaultOffCom
 
         public override string Id { get; } = "DockerReference";
 
-        public override IEnumerable<string> Categories => new[] { Enum.GetName(typeof(DetectorClass), DetectorClass.GoMod) };
+        public override IEnumerable<string> Categories => new[] { Enum.GetName(typeof(DetectorClass), DetectorClass.DockerReference) };
 
         public override IList<string> SearchPatterns { get; } = new List<string> { "dockerfile", "dockerfile.*", "*.dockerfile" };