add option to exit checkout command

Author: mrados7

cmd/checkout/main.go

@@ -71,6 +71,8 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 
 	case tea.KeyMsg:
 		switch msg.Type {
+		case tea.KeyCtrlC, tea.KeyEsc:
+			return m, tea.Quit
 		case tea.KeyRight:
 			if m.step < 2 {
 				m.step++