enable auto-mergers (#661)

Contributes to rapidsai/build-planning#251

Makes it possible to merge PRs with `/merge` here.

Author: jameslamb

.github/ops-bot.yaml

@@ -1 +1,9 @@
+# This file controls which features from the `ops-bot` repository below are enabled.
+# - https://github.com/rapidsai/ops-bot
+
+auto_merger: true
+branch_checker: false
+label_checker: false
+release_drafter: false
 forward_merger: true
+merge_barriers: true