Unexport checkpoint command

This patch unexports the `checkpoint` command.

Signed-off-by: Alano Terblanche <18033717+Benehiko@users.noreply.github.com>

Author: Benehiko

cli/command/checkpoint/cmd.go

@@ -3,26 +3,37 @@ package checkpoint
 import (
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
+	"github.com/docker/cli/internal/commands"
 	"github.com/spf13/cobra"
 )
 
+func init() {
+	commands.Register(newCheckpointCommand)
+}
+
 // NewCheckpointCommand returns the `checkpoint` subcommand (only in experimental)
-func NewCheckpointCommand(dockerCli command.Cli) *cobra.Command {
+//
+// Deprecated: Do not import commands directly. They will be removed in a future release.
+func NewCheckpointCommand(dockerCLI command.Cli) *cobra.Command {
+	return newCheckpointCommand(dockerCLI)
+}
+
+func newCheckpointCommand(dockerCLI command.Cli) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "checkpoint",
 		Short: "Manage checkpoints",
 		Args:  cli.NoArgs,
-		RunE:  command.ShowHelp(dockerCli.Err()),
+		RunE:  command.ShowHelp(dockerCLI.Err()),
 		Annotations: map[string]string{
 			"experimental": "",
 			"ostype":       "linux",
 			"version":      "1.25",
 		},
 	}
 	cmd.AddCommand(
-		newCreateCommand(dockerCli),
-		newListCommand(dockerCli),
-		newRemoveCommand(dockerCli),
+		newCreateCommand(dockerCLI),
+		newListCommand(dockerCLI),
+		newRemoveCommand(dockerCLI),
 	)
 	return cmd
 }

cli/command/commands/commands.go

@@ -45,6 +45,7 @@ func AddCommands(cmd *cobra.Command, dockerCli command.Cli) {
 		// management commands
 		builder.NewBakeStubCommand(dockerCli),
 		builder.NewBuilderCommand(dockerCli),
+		//nolint:staticcheck // TODO: Remove when migration to cli/internal/commands.Register is complete. (see #6283)
 		checkpoint.NewCheckpointCommand(dockerCli),
 		container.NewContainerCommand(dockerCli),
 		context.NewContextCommand(dockerCli),