[recipes] Use named caches for git and workdirs

Bug: skia:
Change-Id: Iaf3d190252c9483c8b9e58a3ab0305db4173cc1c
Reviewed-on: https://skia-review.googlesource.com/123929
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
108 files changed