Merge pull request #5104 from reitermarkus/create-cache

Ensure cache directory for `CacheStoreDatabase` exists.

Library/Homebrew/cache_store.rb

@@ -39,6 +39,7 @@ class CacheStoreDatabase
   # Closes the underlying database (if it is created and open).
   def close_if_open!
     return unless @db
+    cache_path.dirname.mkpath
     cache_path.atomic_write(JSON.dump(@db))
   end