Webpack dev server missing from CSP on "Welcome" pages
When in foreman is run in development and a welcome page is triggered (for example on /environments) when no entries exist yet.
This is done via a `before_filter` in the Application controller, when the welcome filter calls render it'll skip all before filters following.
One of the skipped filters is 'allow_webpack' which should add the webpack_dev server to the CSP rule, when this is not done the browser won't load the bundled CSS and JS and throw JS errors.
This is only a bug for development environments, therefore I'll set it to Low.