are we talking about app cachbuster or "just" cachbuster ?
Sergio, i am not 100% sure but cachebuster doesnt make sense in local enviroment.
src="resources/sap-ui-cachebuster/sap-ui-core.js" sounds like a right path (from my past projects)
documentatio says ResourceServlet should take care of it
btw, what is your platform? abap was?