Internal cache path

[brendt]

Someone mentioned that, when using apache, our internal cache fails because apache is run as a separate user, without write permissions on vendor/. I'm not sure if this is the default behavior or not. A couple of solutions:

• Make internal cache easier to configure, or at least document how
• Write internal cache to somewhere else by default
• Add a proper exception that explains what's wrong when internal cache isn't writeable

[brendt]

Input from Aidan:

Generally speaking you don’t want your web server user to have write access to the app directory. That’s why Laravel has a separate storage/cache directory that the web server is given explicit write permissions to.

This makes sense, we should move our internal cache directory somewhere else

[innocenzi]

We can have a top-level .tempest directory instead

[brendt]

That's what I was thinking yeah. Pretty easy solution