I have a Drupal 8 base theme and a subtheme. There are 3 sites with different DB's that will share this single subtheme.
Each site will use different JS scripts (eg: Google Tag Manager, Parse.ly) that are typically added in html.html.twig and each site will also use JS files that have site-specific code.
It's hard to find documentation on D8 regarding this, but the closest idea I can come up with is either somehow doing this with theme settings or it needs to be done with a custom module that calls these specific files/scripts from the subtheme based on whichever domain/site you're on.
How can I set this up?