pass sync message version in SyncResponse

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

shared/management/networkmap/decode.go

@@ -28,9 +28,6 @@ import (
 //
 //	Peers              base64(wg_pub_key)          // stable across snapshots
 func DecodeEnvelope(env *proto.NetworkMapEnvelope) (*types.NetworkMapComponents, error) {
-	if env == nil {
-		return nil, fmt.Errorf("nil envelope")
-	}
 	full := env.GetFull()
 	if full == nil {
 		return nil, fmt.Errorf("envelope has no Full payload")

shared/management/proto/management.proto

@@ -121,6 +121,11 @@ message SyncRequest {
   PeerSystemMeta meta = 1;
 }
 
+enum SyncResponseVersion {
+  VersionUnknown = 0;
+  VersionComponentNetworkMap = 1;
+}
+
 // SyncResponse represents a state that should be applied to the local peer (e.g. Netbird servers config as well as local peer and remote peers configs)
 message SyncResponse {
 
@@ -156,6 +161,8 @@ message SyncResponse {
   // is left empty: management ships components and the client runs Calculate()
   // locally instead of receiving an expanded NetworkMap.
   NetworkMapEnvelope NetworkMapEnvelope = 8;
+
+  SyncResponseVersion Version = 9;
 }
 
 message  SyncMetaRequest {