feat: Add an app CRD

* support for exposing services (using expose controller)
  by adding element to CRD
* refactor exposecontroller logic out of commands
* An example of an app that uses the exposing services
  feature is https://github.com/jenkins-x-apps/jx-app-grafana
  - specifically see https://github.com/jenkins-x-apps/jx-app-grafana/blob/master/charts/jx-app-grafana/values.yaml#L1-L2 and
  https://github.com/jenkins-x-apps/jx-app-grafana/blob/master/charts/jx-app-grafana/templates/app.yaml

pkg/apis/jenkins.io/v1/register.go

@@ -42,6 +42,8 @@ func addKnownTypes(scheme *runtime.Scheme) error {
 	scheme.AddKnownTypes(SchemeGroupVersion,
 		&BuildPack{},
 		&BuildPackList{},
+		&App{},
+		&AppList{},
 		&CommitStatus{},
 		&CommitStatusList{},
 		&Environment{},

pkg/apis/jenkins.io/v1/types_extensions.go

@@ -411,3 +411,35 @@ type CommitStatusItem struct {
 	Description string `json:"description,omitempty"  protobuf:"bytes,2,opt,name=description"`
 	Pass        bool   `json:"pass"  protobuf:"bytes,3,opt,name=pass"`
 }
+
+// +genclient
+// +genclient:noStatus
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+// +k8s:openapi-gen=true
+
+// App is the metadata for an App
+type App struct {
+	metav1.TypeMeta `json:",inline"`
+	// Standard object's metadata.
+	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata
+	// +optional
+	metav1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
+
+	Spec AppSpec `json:"spec,omitempty" protobuf:"bytes,2,opt,name=spec"`
+}
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+
+// AppList is a structure used by k8s to store lists of apps
+type AppList struct {
+	metav1.TypeMeta `json:",inline"`
+	metav1.ListMeta `json:"metadata"`
+
+	Items []App `json:"items"`
+}
+
+// AppSpec provides details of the metadata for an App
+type AppSpec struct {
+	// A list of services that this App exposes
+	ExposedServices []string `json:"exposedServices,omitempty" protobuf:"bytes,1,opt,name=exposedServices"`
+}

pkg/certmanager/certmanager.go

@@ -0,0 +1,20 @@
+package certmanager
+
+import (
+	"fmt"
+
+	"github.com/jenkins-x/jx/pkg/kube"
+	"k8s.io/client-go/kubernetes"
+)
+
+// CopyCertmanagerResources copies certmanager resources to the targetNamespace
+func CopyCertmanagerResources(targetNamespace string, ic kube.IngressConfig, kubeClient kubernetes.Interface) error {
+	if ic.TLS {
+		err := kube.CleanCertmanagerResources(kubeClient, targetNamespace, ic)
+		if err != nil {
+			return fmt.Errorf("failed to create certmanager resources in target namespace %s: %v", targetNamespace, err)
+		}
+	}
+
+	return nil
+}