fix: exit code 0 on clean shutdown

Signed-off-by: Leonardo Cecchi <leonardo.cecchi@enterprisedb.com>

internal/cnpgi/instance/manager.go

@@ -2,6 +2,7 @@ package instance
 
 import (
 	"context"
+	"errors"
 	"os"
 	"path"
 
@@ -94,6 +95,10 @@ func Start(ctx context.Context) error {
 	}
 
 	if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
+		if errors.Is(err, context.Canceled) {
+			return nil
+		}
+
 		setupLog.Error(err, "problem running manager")
 		return err
 	}

internal/cnpgi/operator/manager.go

@@ -19,6 +19,7 @@ package operator
 import (
 	"context"
 	"crypto/tls"
+	"errors"
 
 	// +kubebuilder:scaffold:imports
 	cnpgv1 "github.com/cloudnative-pg/cloudnative-pg/api/v1"
@@ -155,6 +156,10 @@ func Start(ctx context.Context) error {
 
 	setupLog.Info("starting manager")
 	if err := mgr.Start(ctx); err != nil {
+		if errors.Is(err, context.Canceled) {
+			return nil
+		}
+
 		setupLog.Error(err, "problem running manager")
 		return err
 	}

internal/cnpgi/restore/manager.go

@@ -2,6 +2,7 @@ package restore
 
 import (
 	"context"
+	"errors"
 	"os"
 
 	cnpgv1 "github.com/cloudnative-pg/cloudnative-pg/api/v1"
@@ -93,6 +94,9 @@ func Start(ctx context.Context) error {
 	}
 
 	if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
+		if errors.Is(err, context.Canceled) {
+			return nil
+		}
 		setupLog.Error(err, "problem running manager")
 		return err
 	}