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/main_test.go

@@ -0,0 +1,33 @@
+package copy
+
+import (
+	"path"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/warewulf/warewulf/internal/pkg/testenv"
+	"github.com/warewulf/warewulf/internal/pkg/warewulfd"
+)
+
+func Test_Copy(t *testing.T) {
+	env := testenv.New(t)
+	env.WriteFile(path.Join(testenv.WWChrootdir, "test-image/rootfs/bin/sh"), `test`)
+	defer env.RemoveAll()
+	warewulfd.SetNoDaemon()
+
+	t.Run("image copy without build", func(t *testing.T) {
+		baseCmd := GetCommand()
+		baseCmd.SetArgs([]string{"test-image", "test-image-copy-without-build"})
+		err := baseCmd.Execute()
+		assert.NoError(t, err)
+		assert.NoFileExists(t, path.Join(env.BaseDir, testenv.WWProvisiondir, "image", "test-image-copy-without-build.img"))
+	})
+
+	t.Run("image copy with build", func(t *testing.T) {
+		baseCmd := GetCommand()
+		baseCmd.SetArgs([]string{"-b", "test-image", "test-image-copy"})
+		err := baseCmd.Execute()
+		assert.NoError(t, err)
+		assert.FileExists(t, path.Join(env.BaseDir, testenv.WWProvisiondir, "image", "test-image-copy.img"))
+	})
+}