`fly sftp find` can not be aborted

[abitrolly]

Describe the bug
Pressing Ctrl-C while running sftp find has to effect.

fly sftp find

• Operating system: Linux
• fly version: flyctl v0.3.209 linux/amd64 Commit: 9383e01 BuildDate: 2025-11-06T10:29:04Z

Possible fix

Add Ctrl-C handler here:

flyctl/internal/command/ssh/sftp.go

Lines 189 to 196 in 30f4653

	walker := ftp.Walk(root)
	for walker.Step() {
	if err = walker.Err(); err != nil {
	return err
	}
	fmt.Println(walker.Path())
	}