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/copy/root.go

@@ -0,0 +1,35 @@
+package copy
+
+import (
+	"github.com/spf13/cobra"
+	"github.com/warewulf/warewulf/internal/pkg/image"
+)
+
+var (
+	baseCmd = &cobra.Command{
+		DisableFlagsInUseLine: true,
+		Use:                   "copy IMAGE NEW_NAME",
+		Aliases:               []string{"cp"},
+		Short:                 "Copy an existing image",
+		Long:                  "This command will duplicate an imported image.",
+		RunE:                  CobraRunE,
+		Args:                  cobra.MinimumNArgs(2),
+		ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+			if len(args) != 0 {
+				return nil, cobra.ShellCompDirectiveNoFileComp
+			}
+			list, _ := image.ListSources()
+			return list, cobra.ShellCompDirectiveNoFileComp
+		},
+	}
+	Build bool
+)
+
+func init() {
+	baseCmd.PersistentFlags().BoolVarP(&Build, "build", "b", false, "Build image after copy")
+}
+
+// GetRootCommand returns the root cobra.Command for the application.
+func GetCommand() *cobra.Command {
+	return baseCmd
+}