Add roller to OWNERS

Bug: b/306169290
Change-Id: Ic63e7d5ab1a0efa8eb8d4ed5fd2cf05ec34c5101
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/kudzu/+/176762
Commit-Queue: Auto-Submit <auto-submit@pigweed-service-accounts.iam.gserviceaccount.com>
Reviewed-by: Anthony DiGirolamo <tonymd@google.com>
Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com>
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
diff --git a/third_party/OWNERS b/third_party/OWNERS
new file mode 100644
index 0000000..3a75bf0
--- /dev/null
+++ b/third_party/OWNERS
@@ -0,0 +1 @@
+pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com