feat(k8s): Kubernetes namespace per organization (#5309)

pipeline/backend/kubernetes/namespace.go

@@ -0,0 +1,41 @@
+package kubernetes
+
+import (
+	"context"
+
+	"github.com/rs/zerolog/log"
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+type K8sNamespaceClient interface {
+	Get(ctx context.Context, name string, opts metav1.GetOptions) (*v1.Namespace, error)
+	Create(ctx context.Context, namespace *v1.Namespace, opts metav1.CreateOptions) (*v1.Namespace, error)
+}
+
+func mkNamespace(ctx context.Context, client K8sNamespaceClient, namespace string) error {
+	_, err := client.Get(ctx, namespace, metav1.GetOptions{})
+	if err == nil {
+		log.Trace().Str("namespace", namespace).Msg("Kubernetes namespace already exists")
+		return nil
+	}
+
+	if !errors.IsNotFound(err) {
+		log.Trace().Err(err).Str("namespace", namespace).Msg("failed to check Kubernetes namespace existence")
+		return err
+	}
+
+	log.Trace().Str("namespace", namespace).Msg("creating Kubernetes namespace")
+
+	_, err = client.Create(ctx, &v1.Namespace{
+		ObjectMeta: metav1.ObjectMeta{Name: namespace},
+	}, metav1.CreateOptions{})
+	if err != nil {
+		log.Error().Err(err).Str("namespace", namespace).Msg("failed to create Kubernetes namespace")
+		return err
+	}
+
+	log.Trace().Str("namespace", namespace).Msg("Kubernetes namespace created successfully")
+	return nil
+}