APIServer: Add Method for Installer-Based Apps to Self-Register with the APIRegistrar (#112479)

* [APIServer] Add the method RegisterAPIInstaller to the APIRegistrar interface, and implement it in the builder. This allows new installer-based apps to register themselves in enterprise.

* Rename RegisterAPIInstaller to RegisterAppInstaller

pkg/services/apiserver/builder/common.go

@@ -15,6 +15,7 @@ import (
 	"k8s.io/kube-openapi/pkg/common"
 	"k8s.io/kube-openapi/pkg/spec3"
 
+	appsdkapiserver "github.com/grafana/grafana-app-sdk/k8s/apiserver"
 	grafanarest "github.com/grafana/grafana/pkg/apiserver/rest"
 	"github.com/grafana/grafana/pkg/services/apiserver/options"
 	"github.com/grafana/grafana/pkg/storage/unified/apistore"
@@ -113,6 +114,7 @@ type APIRoutes struct {
 
 type APIRegistrar interface {
 	RegisterAPI(builder APIGroupBuilder)
+	RegisterAppInstaller(installer appsdkapiserver.AppInstaller)
 }
 
 func getGroup(builder APIGroupBuilder) (string, error) {

pkg/services/apiserver/service.go

@@ -248,6 +248,10 @@ func (s *service) RegisterAPI(b builder.APIGroupBuilder) {
 	s.builders = append(s.builders, b)
 }
 
+func (s *service) RegisterAppInstaller(i appsdkapiserver.AppInstaller) {
+	s.appInstallers = append(s.appInstallers, i)
+}
+
 // nolint:gocyclo
 func (s *service) start(ctx context.Context) error {
 	// Get the list of groups the server will support