Build oauth plugin on stable-3.3

Change-Id: I7db185d02f03308e7940244a507bf505deb27887
diff --git a/jenkins/gerrit-bazel-plugin-oauth.yaml b/jenkins/gerrit-bazel-plugin-oauth.yaml
index d2ffd8a..655ddf7 100644
--- a/jenkins/gerrit-bazel-plugin-oauth.yaml
+++ b/jenkins/gerrit-bazel-plugin-oauth.yaml
@@ -11,4 +11,5 @@
             - master
           gerrit-branch:
             - master
+            - stable-3.3
             - stable-3.2