What is the correct way to configure cache.locale.backend.options.cache_dir on Omeka S?
Should I use /config/local.config.php? How exactly?
What are you trying to do? Omeka S doesn’t really have an equivalent to the locale cache from Omeka Classic: locale stuff in S is handled through PHP native code (the intl extension) and doesn’t really have the same caching requirements.
I am trying to set a specific folder (per site) for the cache. The purpose is to improve latency on a shared (multi-sites) installation.
Are there specific cache files you’re seeing created by Omeka S that you’re looking to relocate?
No, the purpose is only to avoid several installations to use the same common cache at the same time. Maybe it makes little sense.