diskimage-builder/diskimage_builder/elements/devuser/environment.d/50-devuser

export DIB_DEV_USER_USERNAME=${DIB_DEV_USER_USERNAME:-devuser}
export DIB_DEV_USER_SHELL=${DIB_DEV_USER_SHELL:-}
export DIB_DEV_USER_PWDLESS_SUDO=${DIB_DEV_USER_PWDLESS_SUDO:-}
export DIB_DEV_USER_AUTHORIZED_KEYS=${DIB_DEV_USER_AUTHORIZED_KEYS:-}
export DIB_DEV_USER_PASSWORD=${DIB_DEV_USER_PASSWORD:-}