Alerting: Define rules.alerting.grafana.app/v0alpha1 AlertRule and RecordingRule

The first version of the app platform apis for alerting rules, including AlertRule and RecordingRule definitions.

Co-authored-by: William Wernert <william.wernert@grafana.com>

apps/alerting/rules/pkg/app/app.go

@@ -0,0 +1,43 @@
+package app
+
+import (
+	"context"
+
+	"github.com/grafana/grafana-app-sdk/app"
+	"github.com/grafana/grafana-app-sdk/logging"
+	"github.com/grafana/grafana-app-sdk/simple"
+
+	"github.com/grafana/grafana/apps/alerting/rules/pkg/apis"
+)
+
+func New(cfg app.Config) (app.App, error) {
+	managedKinds := make([]simple.AppManagedKind, 0)
+	for _, kinds := range apis.GetKinds() {
+		for _, kind := range kinds {
+			managedKinds = append(managedKinds, simple.AppManagedKind{Kind: kind})
+		}
+	}
+
+	c := simple.AppConfig{
+		Name:       "alerting.rules",
+		KubeConfig: cfg.KubeConfig,
+		InformerConfig: simple.AppInformerConfig{
+			ErrorHandler: func(ctx context.Context, err error) {
+				logging.DefaultLogger.With("error", err).Error("Informer processing error")
+			},
+		},
+		ManagedKinds: managedKinds,
+	}
+
+	a, err := simple.NewApp(c)
+	if err != nil {
+		return nil, err
+	}
+
+	err = a.ValidateManifest(cfg.ManifestData)
+	if err != nil {
+		return nil, err
+	}
+
+	return a, nil
+}