Rename "container" to "image"

- Updated `wwctl upgrade` to handle updates
- Maintained `.Container` and `.ContainerName` in tstruct
- Added `ContainerName()` methods to node and profile objects
- Added `--container`, `-C` aliases to wwctl commands (`<node|profile> <add|set>`)
- Added `wwctl container` alias
- Added support for `container_exit.sh` if `image_exit.sh` is not found

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

internal/app/wwctl/image/root.go

@@ -0,0 +1,45 @@
+package image
+
+import (
+	"github.com/spf13/cobra"
+	"github.com/warewulf/warewulf/internal/app/wwctl/image/build"
+	"github.com/warewulf/warewulf/internal/app/wwctl/image/copy"
+	"github.com/warewulf/warewulf/internal/app/wwctl/image/delete"
+	"github.com/warewulf/warewulf/internal/app/wwctl/image/exec"
+	"github.com/warewulf/warewulf/internal/app/wwctl/image/imprt"
+	"github.com/warewulf/warewulf/internal/app/wwctl/image/kernels"
+	"github.com/warewulf/warewulf/internal/app/wwctl/image/list"
+	"github.com/warewulf/warewulf/internal/app/wwctl/image/rename"
+	"github.com/warewulf/warewulf/internal/app/wwctl/image/shell"
+	"github.com/warewulf/warewulf/internal/app/wwctl/image/show"
+	"github.com/warewulf/warewulf/internal/app/wwctl/image/syncuser"
+)
+
+var baseCmd = &cobra.Command{
+	DisableFlagsInUseLine: true,
+	Use:                   "image COMMAND [OPTIONS]",
+	Short:                 "Operating system image management",
+	Long: "Starting with version 4, Warewulf uses images to build the bootable\n" +
+		"node images. These commands will help you import, manage, and transform\n" +
+		"images into bootable Warewulf images.",
+	Aliases: []string{"vnfs", "container"},
+}
+
+func init() {
+	baseCmd.AddCommand(build.GetCommand())
+	baseCmd.AddCommand(list.GetCommand())
+	baseCmd.AddCommand(imprt.GetCommand())
+	baseCmd.AddCommand(exec.GetCommand())
+	baseCmd.AddCommand(shell.GetCommand())
+	baseCmd.AddCommand(delete.GetCommand())
+	baseCmd.AddCommand(show.GetCommand())
+	baseCmd.AddCommand(syncuser.GetCommand())
+	baseCmd.AddCommand(copy.GetCommand())
+	baseCmd.AddCommand(rename.GetCommand())
+	baseCmd.AddCommand(kernels.GetCommand())
+}
+
+// GetRootCommand returns the root cobra.Command for the application.
+func GetCommand() *cobra.Command {
+	return baseCmd
+}