Codebox need two directories for managing addons:
WORKSPACE_ADDONS_DEFAULTS_DIR(don't change if you don't know what you're doing)
WORKSPACE_ADDONS_DEFAULTS_DIR will be access in read-only mode but
WORKSPACE_ADDONS_DIR need write permissions.
By default, Codebox will store the new addons into
Caution: If the directory doesn't exists, Codebox will recursively create it.