[bug]: Cannot create mutation webhook with built-in resources

[stevefan1999-personal]

Describe the bug

Ditto to title

To reproduce

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <InvariantGlobalization>true</InvariantGlobalization>
    <PublishAot>true</PublishAot>
    <EnablePreviewFeatures>true</EnablePreviewFeatures>
    <JsonSerializerIsReflectionEnabledByDefault>true</JsonSerializerIsReflectionEnabledByDefault>
    <TrimMode>copy</TrimMode>
    <EnableTrimAnalyzer>true</EnableTrimAnalyzer>
    <IlcGenerateCompleteTypeMetadata>true</IlcGenerateCompleteTypeMetadata>

  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="KubeOps.Generator" Version="8.0.1-pre.6" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
    <PackageReference Include="KubeOps.Operator.Web" Version="8.0.1-pre.6" />
  </ItemGroup>

</Project>

using k8s.Models;
using KubeOps.Abstractions.Controller;
using KubeOps.Abstractions.Entities;
using KubeOps.Abstractions.Rbac;
using KubeOps.Operator;
using KubeOps.Operator.Web.Builder;
using KubeOps.Operator.Web.Webhooks.Admission.Mutation;
var builder = WebApplication.CreateSlimBuilder(args);

builder.Services
    .AddKubernetesOperator()
    .RegisterComponents()
#if DEBUG
    .AddDevelopmentTunnel(5000)
#endif
    ;
builder.Services
    .AddControllers();

var app = builder.Build();

app.UseRouting();
app.UseDeveloperExceptionPage();
app.MapControllers();

app.MapGet("/", () => "Hello World!");

await app.RunAsync();

[MutationWebhook(typeof(V1Service))]
public class ServiceMutationWebhook(ILogger<ServiceMutationWebhook> logger) : MutationWebhook<V1Service>
{
    public override MutationResult<V1Service> Create(V1Service entity, bool dryRun)
    {
        logger.LogInformation("{}", entity);

        return NoChanges();
    }
}

Expected behavior

It works

Screenshots

fail: Microsoft.Extensions.Hosting.Internal.Host[11]
      Hosting failed to start
      k8s.Autorest.HttpOperationException: Operation returned an invalid status code 'UnprocessableEntity', response body {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"MutatingWebhookConfiguration.admissionregistration.k8s.io \"dev-mutators\" is invalid: webhooks[1].name: Invalid value: \"mutate.service..v1\": a lowercase RFC 1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')","reason":"Invalid","details":{"name":"dev-mutators","group":"admissionregistration.k8s.io","kind":"MutatingWebhookConfiguration","causes":[{"reason":"FieldValueInvalid","message":"Invalid value: \"mutate.service..v1\": a lowercase RFC 1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')","field":"webhooks[1].name"}]},"code":422}

         at k8s.Kubernetes.SendRequestRaw(String requestContent, HttpRequestMessage httpRequest, CancellationToken cancellationToken)
         at k8s.AbstractKubernetes.ICustomObjectsOperations_ReplaceClusterCustomObjectWithHttpMessagesAsync[T](Object body, String group, String version, String plural, String name, String dryRun, String fieldManager, IReadOnlyDictionary`2 customHeaders, CancellationToken cancellationToken)
         at k8s.AbstractKubernetes.k8s.ICustomObjectsOperations.ReplaceClusterCustomObjectWithHttpMessagesAsync[T](Object body, String group, String version, String plural, String name, String dryRun, String fieldManager, IReadOnlyDictionary`2 customHeaders, CancellationToken cancellationToken)
         at k8s.GenericClient.ReplaceAsync[T](T obj, String name, CancellationToken cancel)
         at KubeOps.KubernetesClient.KubernetesClient.UpdateAsync[TEntity](TEntity entity)
         at KubeOps.KubernetesClient.IKubernetesClient.SaveAsync[TEntity](TEntity entity)
         at KubeOps.Operator.Web.LocalTunnel.DevelopmentTunnelService.RegisterMutators(Uri uri)
         at KubeOps.Operator.Web.LocalTunnel.DevelopmentTunnelService.StartAsync(CancellationToken cancellationToken)
         at Microsoft.Extensions.Hosting.Internal.Host.<StartAsync>b__15_1(IHostedService service, CancellationToken token)
         at Microsoft.Extensions.Hosting.Internal.Host.ForeachService[T](IEnumerable`1 services, CancellationToken token, Boolean concurrent, Boolean abortOnFirstException, List`1 exceptions, Func`3 operation)
Unhandled exception. k8s.Autorest.HttpOperationException: Operation returned an invalid status code 'UnprocessableEntity', response body {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"MutatingWebhookConfiguration.admissionregistration.k8s.io \"dev-mutators\" is invalid: webhooks[1].name: Invalid value: \"mutate.service..v1\": a lowercase RFC 1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')","reason":"Invalid","details":{"name":"dev-mutators","group":"admissionregistration.k8s.io","kind":"MutatingWebhookConfiguration","causes":[{"reason":"FieldValueInvalid","message":"Invalid value: \"mutate.service..v1\": a lowercase RFC 1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')","field":"webhooks[1].name"}]},"code":422}

   at k8s.Kubernetes.SendRequestRaw(String requestContent, HttpRequestMessage httpRequest, CancellationToken cancellationToken)
   at k8s.AbstractKubernetes.ICustomObjectsOperations_ReplaceClusterCustomObjectWithHttpMessagesAsync[T](Object body, String group, String version, String plural, String name, String dryRun, String fieldManager, IReadOnlyDictionary`2 customHeaders, CancellationToken cancellationToken)    
   at k8s.AbstractKubernetes.k8s.ICustomObjectsOperations.ReplaceClusterCustomObjectWithHttpMessagesAsync[T](Object body, String group, String version, String plural, String name, String dryRun, String fieldManager, IReadOnlyDictionary`2 customHeaders, CancellationToken cancellationToken)
   at k8s.GenericClient.ReplaceAsync[T](T obj, String name, CancellationToken cancel)
   at KubeOps.KubernetesClient.KubernetesClient.UpdateAsync[TEntity](TEntity entity)
   at KubeOps.KubernetesClient.IKubernetesClient.SaveAsync[TEntity](TEntity entity)
   at KubeOps.Operator.Web.LocalTunnel.DevelopmentTunnelService.RegisterMutators(Uri uri)
   at KubeOps.Operator.Web.LocalTunnel.DevelopmentTunnelService.StartAsync(CancellationToken cancellationToken)
   at Microsoft.Extensions.Hosting.Internal.Host.<StartAsync>b__15_1(IHostedService service, CancellationToken token)
   at Microsoft.Extensions.Hosting.Internal.Host.ForeachService[T](IEnumerable`1 services, CancellationToken token, Boolean concurrent, Boolean abortOnFirstException, List`1 exceptions, Func`3 operation)
   at Microsoft.Extensions.Hosting.Internal.Host.StartAsync(CancellationToken cancellationToken)
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)
   at Program.<Main>$(String[] args) in F:\csharp\SteamGsltOperator\SteamGsltOperator.Operator\Program.cs:line 29
   at Program.<Main>(String[] args)

Additional Context

No response

[stevefan1999-personal]

https://github.com/buehler/dotnet-operator-sdk/blob/bfc9f7b0fdec13646d45cd84b4801db2416a0682/src/KubeOps.Operator.Web/LocalTunnel/DevelopmentTunnelService.cs#L90
Offending line

[robertcoltheart]

Is there a fix for this please? I can't add mutating web hooks for Pods because the entity does not have a group. I'm happy to contribute a PR to default to "core" for groups