[Installer] should ignore cache directory

[diver]

At least HaikuDepot stores a few thousands icons in cache directory. Cloning already installed haiku to another partition becomes really slow in this case.

​https://xref.plausible.coop/source/xref/haiku/src/apps/installer/WorkerThread.cpp#95

[waddlesplash]

Fixed in hrev53252.

[diver]

This fix actually caused problems. Since cache isn't copied anymore it is not present for case when you use Installer to copy existing installation to another partition.

Then all apps that need cache folder will fail. For example HaikuDepot will complain.

To workaround it one can do this:

unmount ~/config
mkdir ~/config/cache

[pulkomandy]

Why do we want to ignore it in the first place? It's not /tmp, the cache is surely meant to be somewhat persistant. If an app is storing too much data there, we should rather fix that?

Please always include a description in tickets, that would help :)

[pulkomandy]

Change reverted in hrev53578, we need something that doesn't break the resulting install.

[kallisti5]

Removing blocker status since it was reverted. This one is still an issue but doesn't appear to be a R1 Beta2 blocker