Pin the default client image with digest (#227)

This changes the default client image from latest to a pinned digest. It
also enforces that the default image version tag matches the version of
the Netbird dependency.

This makes testing a lot easier and also ensures that we wont get
untested behavior introduced if the client makes a breaking change.

Signed-off-by: Philip Laine <philip.laine@gmail.com>

cmd/main.go

@@ -48,6 +48,7 @@ import (
 	nbv1 "github.com/netbirdio/kubernetes-operator/api/v1"
 	nbv1alpha1 "github.com/netbirdio/kubernetes-operator/api/v1alpha1"
 	"github.com/netbirdio/kubernetes-operator/internal/controller"
+	"github.com/netbirdio/kubernetes-operator/internal/version"
 	nbwebhookv1 "github.com/netbirdio/kubernetes-operator/internal/webhook/v1"
 )
 
@@ -84,7 +85,7 @@ func main() {
 	)
 	flag.StringVar(&runtimeNamespace, "runtime-namespace", "", "Namespace the controller is running in")
 	flag.StringVar(&managementURL, "netbird-management-url", "https://api.netbird.io", "Management service URL")
-	flag.StringVar(&clientImage, "netbird-client-image", "netbirdio/netbird:latest", "Image for netbird client container")
+	flag.StringVar(&clientImage, "netbird-client-image", "", "Image for netbird client container")
 	flag.StringVar(
 		&clusterName,
 		"cluster-name",
@@ -148,6 +149,10 @@ func main() {
 		os.Exit(1)
 	}
 
+	if clientImage == "" {
+		clientImage = version.ClientImage()
+	}
+
 	defaultLabelsMap := make(map[string]string)
 	if defaultLabels != "" {
 		for s := range strings.SplitSeq(defaultLabels, ",") {