Support publishing ports for the worker nodes

All ports exposed by --publish will also be exported for all worker
nodes. The host port will be auto indexed based worker id.

For example: with the following command option:

k3d create --publish  80:80  --publish 90:90/udp --workers 1

The exposed ports will be:

host TCP port 80  -> k3s server TCP 80
host TCP port 90  -> k3s server TCP 90
host UDP port 81 -> k3s worker 0 UDP 80
host UDP port 91 -> k3s worker 0 UDP 90

cli/commands.go

@@ -150,6 +150,7 @@ func CreateCluster(c *cli.Context) error {
 				strings.Split(c.String("volume"), ","),
 				i,
 				c.String("port"),
+				publishedPorts,
 			)
 			if err != nil {
 				return fmt.Errorf("ERROR: failed to create worker node for cluster %s\n%+v", c.String("name"), err)

cli/container.go

@@ -190,7 +190,8 @@ func createServer(verbose bool, image string, port string, args []string, env []
 }
 
 // createWorker creates/starts a k3s agent node that connects to the server
-func createWorker(verbose bool, image string, args []string, env []string, name string, volumes []string, postfix int, serverPort string) (string, error) {
+func createWorker(verbose bool, image string, args []string, env []string, name string, volumes []string,
+		  postfix int, serverPort string, pPorts *PublishedPorts) (string, error) {
 	containerLabels := make(map[string]string)
 	containerLabels["app"] = "k3d"
 	containerLabels["component"] = "worker"
@@ -201,11 +202,14 @@ func createWorker(verbose bool, image string, args []string, env []string, name
 
 	env = append(env, fmt.Sprintf("K3S_URL=https://k3d-%s-server:%s", name, serverPort))
 
+	workerPublishedPorts := pPorts.Offset(postfix + 1)
+
 	hostConfig := &container.HostConfig{
 		Tmpfs: map[string]string{
 			"/run":     "",
 			"/var/run": "",
 		},
+		PortBindings: workerPublishedPorts.PortBindings,
 		Privileged: true,
 	}
 
@@ -226,6 +230,7 @@ func createWorker(verbose bool, image string, args []string, env []string, name
 		Image:    image,
 		Env:      env,
 		Labels:   containerLabels,
+		ExposedPorts: workerPublishedPorts.ExposedPorts,
 	}
 
 	id, err := startContainer(verbose, config, hostConfig, networkingConfig, containerName)