This builder re-creates ci/build_merge_into_chromeos and just calls
the merge_bot script.
Eventually this could be better integrated with Luci UI. For now,
this is feature parity with Kokoro.
BUG=b:233913643
TEST=recipe.py run merge_into_chromeos
Change-Id: Ia5de775cad943687be654c3a054f1150ba9adbb1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3673786
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
