update run command to run a stub service container on the connected node

internal/cli/service.go

@@ -0,0 +1,41 @@
+package cli
+
+import (
+	"context"
+	"fmt"
+	"github.com/docker/docker/api/types/container"
+)
+
+// ServiceOptions contains all the options for creating a service.
+type ServiceOptions struct {
+	Image   string
+	Name    string
+	Publish []string
+}
+
+func (cli *CLI) RunService(ctx context.Context, clusterName string, opts *ServiceOptions) error {
+	c, err := cli.ConnectCluster(ctx, clusterName)
+	if err != nil {
+		return fmt.Errorf("connect to cluster: %w", err)
+	}
+	defer func() {
+		_ = c.Close()
+	}()
+
+	config := &container.Config{
+		Image: opts.Image,
+	}
+	// TODO: generate a container name from the service name.
+	// TODO: set service labels on the container.
+	resp, err := c.CreateContainer(ctx, config, nil, nil, nil, opts.Name)
+	if err != nil {
+		return fmt.Errorf("create container: %w", err)
+	}
+
+	if err = c.StartContainer(ctx, resp.ID, container.StartOptions{}); err != nil {
+		return fmt.Errorf("start container: %w", err)
+	}
+
+	fmt.Printf("Service %q started with container ID %q\n", opts.Name, resp.ID)
+	return nil
+}