Add .github/ops-bot.yaml config file (#991)

In the near future, the [rapidsai/ops-bot](https://github.com/rapidsai/ops-bot) GitHub application that we use for GitHub automation will be enabled on all repositories in the `rapidsai` GitHub organization. Since not all features of the application are applicable to all repositories, this PR adds a new file, `.github/ops-bot.yaml`, which can configure which features are enabled per repository.

Authors:
  - AJ Schmidt (https://github.com/ajschmidt8)

Approvers:
  - Jake Awe (https://github.com/AyodeAwe)

URL: #991

.github/ops-bot.yaml

@@ -0,0 +1,8 @@
+# This file controls which features from the `ops-bot` repository below are enabled.
+# - https://github.com/rapidsai/ops-bot
+
+auto_merger: true
+branch_checker: true
+label_checker: true
+release_drafter: true
+external_contributors: true