This PR does the following things:

1. add new registry api under resources.kubesphere.io/v1alpha3
2. deprecate registry api v1alpha2

Registry API v1alpha2 uses docker client to authenticate image registry
secret, which depends on docker.sock. We used to mount host
`/var/run/docker.sock` to deployment. It will prevent us imgrating to
containerd since no `docker.sock` exists. Registry API v1alpha3 comes to
rescure, it wraps library go-containerregistry and compatible with
docker registry, Harbor etc.

pkg/models/registries/v2/registries.go

@@ -0,0 +1,71 @@
+package v2
+
+import (
+	"github.com/google/go-containerregistry/pkg/name"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/remote"
+)
+
+type Registryer interface {
+	// list repository tags
+	ListRepositoryTags(image string) (RepositoryTags, error)
+
+	// get image config
+	Config(image string) (*v1.ConfigFile, error)
+}
+
+type registryer struct {
+	opts options
+}
+
+func NewRegistryer(opts ...Option) *registryer {
+	return &registryer{
+		opts: makeOptions(opts...),
+	}
+}
+
+func (r *registryer) ListRepositoryTags(src string) (RepositoryTags, error) {
+	repo, err := name.NewRepository(src, r.opts.name...)
+	if err != nil {
+		return RepositoryTags{}, err
+	}
+
+	tags, err := remote.List(repo, r.opts.remote...)
+	if err != nil {
+		return RepositoryTags{}, err
+	}
+
+	return RepositoryTags{
+		Registry:   repo.RegistryStr(),
+		Repository: repo.RepositoryStr(),
+		Tags:       tags,
+	}, nil
+}
+
+func (r *registryer) Config(image string) (*v1.ConfigFile, error) {
+	img, _, err := r.getImage(image)
+	if err != nil {
+		return nil, err
+	}
+
+	configFile, err := img.ConfigFile()
+	if err != nil {
+		return nil, err
+	}
+
+	return configFile, nil
+}
+
+func (r *registryer) getImage(reference string) (v1.Image, name.Reference, error) {
+	ref, err := name.ParseReference(reference, r.opts.name...)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	img, err := remote.Image(ref, r.opts.remote...)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return img, ref, nil
+}