Add version to cli (#32)

* Add version flag to cli

Signed-off-by: galal-hussein <hussein.galal.ahmed.11@gmail.com>

* Add version to cluster spec

---------

Signed-off-by: galal-hussein <hussein.galal.ahmed.11@gmail.com>

cli/cmds/cluster/create.go

@@ -34,6 +34,7 @@ var (
 	agents      int64
 	serverArgs  cli.StringSlice
 	agentArgs   cli.StringSlice
+	version     string
 
 	clusterCreateFlags = []cli.Flag{
 		cli.StringFlag{
@@ -77,6 +78,12 @@ var (
 			Usage: "agents extra arguments",
 			Value: &agentArgs,
 		},
+		cli.StringFlag{
+			Name:        "version",
+			Usage:       "k3s version",
+			Destination: &version,
+			Value:       "v1.26.1+k3s1",
+		},
 	}
 )
 
@@ -146,6 +153,7 @@ func newCluster(name, token string, servers, agents int32, clusterCIDR, serviceC
 			ServiceCIDR: serviceCIDR,
 			ServerArgs:  serverArgs,
 			AgentArgs:   agentArgs,
+			Version:     version,
 		},
 	}
 }