Add version info command to signal server (#739)

Add version command to signal and management servers.

The version information will be filled during build time.

signal/client/client.go

@@ -2,11 +2,13 @@ package client
 
 import (
 	"fmt"
-	"github.com/netbirdio/netbird/client/system"
-	"github.com/netbirdio/netbird/signal/proto"
-	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 	"io"
 	"strings"
+
+	"github.com/netbirdio/netbird/signal/proto"
+	"github.com/netbirdio/netbird/version"
+
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 )
 
 // A set of tools to exchange connection details (Wireguard endpoints) with the remote peer.
@@ -50,7 +52,7 @@ func MarshalCredential(myKey wgtypes.Key, myPort int, remoteKey wgtypes.Key, cre
 			Type:           t,
 			Payload:        fmt.Sprintf("%s:%s", credential.UFrag, credential.Pwd),
 			WgListenPort:   uint32(myPort),
-			NetBirdVersion: system.NetbirdVersion(),
+			NetBirdVersion: version.NetbirdVersion(),
 		},
 	}, nil
 }