[autoroll] Add manual roll support for CAS client -> recipes-py roller
[autoroll] Add manual roll support for CAS client -> recipes-py roller

Change-Id: I55ad7d5b5defd732e9482f2e06ae51fdd3f731d1
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/438816
Reviewed-by: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@google.com>
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot