✨ Extract some commands into kairosctl (#310)

This PR extracts the registration command into a `kairos-register`
binary of its own. The old sub command is kept so users can see a
deprecation notice and adapt for a future release when it's removed. The
version number is shared between binaries.

⚠️ I'm not entirely sure about the gorelease, and would benefit
from a couple of extra 👀 on this, thanks!

relates to kairos-io/kairos#1211

---------

Signed-off-by: Mauro Morales <mauro.morales@spectrocloud.com>
Signed-off-by: Mauro Morales <contact@mauromorales.com>
Signed-off-by: Itxaka <itxaka.garcia@spectrocloud.com>
Signed-off-by: GitHub <noreply@github.com>
Co-authored-by: Dimitris Karakasilis <dimitris@karakasilis.me>
Co-authored-by: Itxaka <itxaka.garcia@spectrocloud.com>
Co-authored-by: ci-robbot [bot] <105103991+ci-robbot@users.noreply.github.com>
Co-authored-by: mudler <mudler@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

internal/cli/get_kubeconfig.go

@@ -0,0 +1,37 @@
+package cli
+
+import (
+	"encoding/base64"
+	"fmt"
+	"strings"
+
+	edgeVPNClient "github.com/mudler/edgevpn/api/client"
+	"github.com/mudler/edgevpn/api/client/service"
+	"github.com/urfave/cli/v2"
+)
+
+var GetKubeConfigCMD = cli.Command{
+	Name:      "get-kubeconfig",
+	Usage:     "Return a deployment kubeconfig",
+	UsageText: "Retrieve a kairos network kubeconfig (only for automated deployments)",
+	Description: `
+		Retrieve a network kubeconfig and prints out to screen.
+		
+		If a deployment was bootstrapped with a network token, you can use this command to retrieve the master node kubeconfig of a network id.
+		
+		For example:
+		
+		$ kairos get-kubeconfig --network-id kairos
+		`,
+	Flags: networkAPI,
+	Action: func(c *cli.Context) error {
+		cc := service.NewClient(
+			c.String("network-id"),
+			edgeVPNClient.NewClient(edgeVPNClient.WithHost(c.String("api"))))
+		str, _ := cc.Get("kubeconfig", "master")
+		b, _ := base64.RawURLEncoding.DecodeString(str)
+		masterIP, _ := cc.Get("master", "ip")
+		fmt.Println(strings.ReplaceAll(string(b), "127.0.0.1", masterIP))
+		return nil
+	},
+}