Add cleanup of staging dir.
Add cleanup of staging dir.

cganas/picoCTF-shell-manager,cganas/picoCTF-shell-manager,cganas/picoCTF-shell-manager,picoCTF/picoCTF-shell-manager,RitwikGupta/picoCTF-shell-manager,RitwikGupta/picoCTF-shell-manager,picoCTF/picoCTF-shell-manager,RitwikGupta/picoCTF-shell-manager,RitwikGupta/picoCTF-shell-manager,picoCTF/picoCTF-shell-manager,cganas/picoCTF-shell-manager,picoCTF/picoCTF-shell-manager