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/exec/child/root.go

@@ -0,0 +1,28 @@
+package child
+
+import (
+	"github.com/spf13/cobra"
+)
+
+var (
+	baseCmd = &cobra.Command{
+		DisableFlagsInUseLine: true,
+		Use:                   "__child",
+		Hidden:                true,
+		RunE:                  CobraRunE,
+		Args:                  cobra.MinimumNArgs(1),
+		FParseErrWhitelist:    cobra.FParseErrWhitelist{UnknownFlags: true},
+	}
+	binds    []string
+	nodename string
+)
+
+func init() {
+	baseCmd.Flags().StringVarP(&nodename, "node", "n", "", "create ro overlay for given node")
+	baseCmd.Flags().StringArrayVarP(&binds, "bind", "b", []string{}, "bind points")
+}
+
+// GetRootCommand returns the root cobra.Command for the application.
+func GetCommand() *cobra.Command {
+	return baseCmd
+}