openstack/flight: add base flight with jump dialer

if an `openstack-host` is present in the command line, the flight will
be created with a proxy jump SSH server.

this allows to SSH into the created VMs from the devstack server and it
avoids consuming more elastic IPs

Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>

platform/machine/openstack/flight.go

@@ -15,9 +15,12 @@
 package openstack
 
 import (
+	"fmt"
+
 	"github.com/coreos/pkg/capnslog"
 	ctplatform "github.com/flatcar-linux/container-linux-config-transpiler/config/platform"
 
+	"github.com/flatcar-linux/mantle/network"
 	"github.com/flatcar-linux/mantle/platform"
 	"github.com/flatcar-linux/mantle/platform/api/openstack"
 )
@@ -44,9 +47,18 @@ func NewFlight(opts *openstack.Options) (platform.Flight, error) {
 		return nil, err
 	}
 
-	bf, err := platform.NewBaseFlight(opts.Options, Platform, ctplatform.OpenStackMetadata)
-	if err != nil {
-		return nil, err
+	var bf *platform.BaseFlight
+
+	if opts.Host != "" {
+		bf, err = platform.NewBaseFlightWithDialer(opts.Options, Platform, ctplatform.OpenStackMetadata, network.NewJumpDialer(opts.Host, opts.User, opts.Keyfile))
+		if err != nil {
+			return nil, fmt.Errorf("creating base flight with jump dialer: %w", err)
+		}
+	} else {
+		bf, err := platform.NewBaseFlight(opts.Options, Platform, ctplatform.OpenStackMetadata)
+		if err != nil {
+			return nil, err
+		}
 	}
 
 	of := &flight{