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/show/main.go

@@ -0,0 +1,38 @@
+package show
+
+import (
+	"fmt"
+
+	"github.com/warewulf/warewulf/internal/pkg/api/image"
+	"github.com/warewulf/warewulf/internal/pkg/api/routes/wwapiv1"
+
+	"github.com/spf13/cobra"
+)
+
+func CobraRunE(cmd *cobra.Command, args []string) (err error) {
+
+	csp := &wwapiv1.ImageShowParameter{
+		ImageName: args[0],
+	}
+
+	var r *wwapiv1.ImageShowResponse
+	r, err = image.ImageShow(csp)
+	if err != nil {
+		return
+	}
+
+	if !ShowAll {
+		fmt.Printf("%s\n", r.Rootfs)
+	} else {
+		kernelVersion := r.KernelVersion
+		if kernelVersion == "" {
+			kernelVersion = "not found"
+		}
+		fmt.Printf("Name: %s\n", r.Name)
+		fmt.Printf("KernelVersion: %s\n", kernelVersion)
+		fmt.Printf("Rootfs: %s\n", r.Rootfs)
+		fmt.Printf("Nr nodes: %d\n", len(r.Nodes))
+		fmt.Printf("Nodes: %s\n", r.Nodes)
+	}
+	return
+}