Support for multiple spring application profiles

Currently the open-vsx spring application has a single application.yml which contains all application related configurations and when we need to switch between Mirror mode vs Non-mirror mode we need to keep editing that file and build a new image from scratch. This also prevents us from being able to merge the mirror mode functionality specific configurations to main branch since our current production needs to continue to function as upstream.

Hence requesting an improvement to the application to support multiple application profiles which can easily be swapped at runtime i.e.Keep common/generic configurations in application.yml and create different profiles for Mirror vs Non-Mirror mode. This will give us the ability to select specific profiles based on where deployment has to happen from a single source of truth i.e. main branch.