add support for tcp cluster connections in uncloud config

internal/cli/cli.go

@@ -88,6 +88,7 @@ func (cli *CLI) ConnectCluster(ctx context.Context, clusterName string) (*client
 
 	// TODO: iterate over all connections and try to connect to the cluster using the first successful connection.
 	conn := cfg.Connections[0]
+	if conn.SSH != "" {
 		user, host, port, err := conn.SSH.Parse()
 		if err != nil {
 			return nil, fmt.Errorf("parse SSH connection %q: %w", conn.SSH, err)
@@ -98,6 +99,10 @@ func (cli *CLI) ConnectCluster(ctx context.Context, clusterName string) (*client
 			Port: port,
 		}
 		return client.New(ctx, connector.NewSSHConnector(sshConfig))
+	} else if conn.TCP.IsValid() {
+		return client.New(ctx, connector.NewTCPConnector(conn.TCP))
+	}
+	return nil, errors.New("no valid connection configuration found for the cluster")
 }
 
 func (cli *CLI) InitCluster(

internal/cli/config/connection.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"net"
+	"net/netip"
 	"strconv"
 	"strings"
 	"uncloud/internal/secret"
@@ -14,6 +15,7 @@ const (
 
 type MachineConnection struct {
 	SSH       SSHDestination `toml:"ssh,omitempty"`
+	TCP       netip.AddrPort `toml:"tcp,omitempty"`
 	Host      string         `toml:"host,omitempty"`
 	PublicKey secret.Secret  `toml:"public_key,omitempty"`
 }