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/shell/main.go

@@ -0,0 +1,52 @@
+//go:build linux
+// +build linux
+
+package shell
+
+import (
+	"fmt"
+	"os"
+	"path"
+
+	"github.com/spf13/cobra"
+	cntexec "github.com/warewulf/warewulf/internal/app/wwctl/image/exec"
+	"github.com/warewulf/warewulf/internal/pkg/image"
+	"github.com/warewulf/warewulf/internal/pkg/wwlog"
+)
+
+func CobraRunE(cmd *cobra.Command, args []string) error {
+
+	imageName := args[0]
+	var allargs []string
+
+	if !image.ValidSource(imageName) {
+		return fmt.Errorf("unknown Warewulf image: %s", imageName)
+	}
+	shellName := os.Getenv("SHELL")
+	if !image.ValidSource(imageName) {
+		return fmt.Errorf("unknown Warewulf image: %s", imageName)
+	}
+	var shells []string
+	if shellName == "" {
+		shells = append(shells, "/bin/bash")
+	} else {
+		shells = append(shells, shellName, "/bin/bash")
+	}
+	for _, s := range shells {
+		if _, err := os.Stat(path.Join(image.RootFsDir(imageName), s)); err == nil {
+			shellName = s
+			break
+		}
+	}
+	args = append(args, shellName)
+	allargs = append(allargs, args...)
+	wwlog.Debug("Calling exec with args: %s", allargs)
+	cntexec.SetBinds(binds)
+	cntexec.SetNode(nodeName)
+	cntexec.SyncUser = syncUser
+	cntexec.Build = build
+	if cntexec.Build {
+		wwlog.Info("Image build will be skipped if the shell ends with a non-zero exit code.")
+	}
+	return cntexec.CobraRunE(cmd, allargs)
+}