Add configmap support

internal/config/config.go

@@ -0,0 +1,50 @@
+package config
+
+import (
+	"context"
+	"fmt"
+
+	corev1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/types"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+type OperatorConfig struct {
+	DefaultNamespace string
+}
+
+type ConfigLoader struct {
+	Client    client.Client
+	Name      string
+	Namespace string
+}
+
+func New(client client.Client, name, namespace string) *ConfigLoader {
+	return &ConfigLoader{
+		Client:    client,
+		Name:      name,
+		Namespace: namespace,
+	}
+}
+
+func (cl *ConfigLoader) Load(ctx context.Context) (*OperatorConfig, error) {
+	cm := &corev1.ConfigMap{}
+	err := cl.Client.Get(ctx, types.NamespacedName{
+		Name:      cl.Name,
+		Namespace: cl.Namespace,
+	}, cm)
+	if err != nil {
+		return nil, fmt.Errorf("failed to load configmap: %w", err)
+	}
+
+	cfg := &OperatorConfig{
+		DefaultNamespace: "default", // fallback
+	}
+
+	if val, ok := cm.Data["defaultNamespace"]; ok && val != "" {
+		cfg.DefaultNamespace = val
+	}
+
+	return cfg, nil
+}
+