[keycloak-dev] Themes: Browser cache not used for static resources (img, css, js)

Hello, I've been deveoping custom keycloak themes which is pretty straight forward thanks to the provided documentation. I am using version 4.8.3.Final. Regarding caching I only see options for freemarker templates caching in standalon.xml, theme section. Opening the network view in Firefox I notice that no caching headers are uses for statice resouces (img, css, js). Thus every visit of the login page reloads all linked static resources from the server. So my question is: How can I provide client side caching of static resources (perhaps by etags with file content hash)? Thanks Jonathan Strampp