Mark production as safe to use optional caches
Mark production as safe to use optional caches

Optional caches require the assets be hashed and available permanently,
which is the case in production.

popcodeorg/popcode,jwang1919/popcode,jwang1919/popcode,popcodeorg/popcode,popcodeorg/popcode,outoftime/learnpad,popcodeorg/popcode,outoftime/learnpad,jwang1919/popcode,jwang1919/popcode