Can I setup the Security Kit module via Drush?
You could update the Security Kit settings via the config-set command:

drush config-set seckit.settings seckit_xss.csp.img-src "'self' 'unsafe-inline'"


You can find the available configuration keys by looking at Security Kit's  default configuration file, config/install/seckit.settings.yml, or you can view your site's current settings through the config export page.