Bot to update buildbucket.config daily

Bug: skia:6591
Change-Id: Ic2ec5b033965ca073a00e272693b1c5e1d0ad69f
Reviewed-on: https://skia-review.googlesource.com/16541
Commit-Queue: Ravi Mistry <rmistry@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
16 files changed