Make sure the port forwarding protocol is always lowercase

The ServicePort.Protocol is always uppercase, e.g. "TCP", but the
api.IPPort.protocol is always lowercase, i.e. "tcp".

Since UDP support was added in lima-vm#2411 the hostagent filters on the
protocol values.

Signed-off-by: Jan Dubois <jan.dubois@suse.com>

pkg/guestagent/kubernetesservice/kubernetesservice.go

@@ -7,6 +7,7 @@ import (
 	"net"
 	"net/url"
 	"os"
+	"strings"
 	"sync"
 	"time"
 
@@ -142,7 +143,7 @@ func (s *ServiceWatcher) GetPorts() []Entry {
 			}
 
 			entries = append(entries, Entry{
-				Protocol: Protocol(portEntry.Protocol),
+				Protocol: Protocol(strings.ToLower(string(portEntry.Protocol))),
 				IP:       net.ParseIP("0.0.0.0"),
 				Port:     uint16(port),
 			})