Build plugin-manager for Gerrit v3.0

Change-Id: Icd1f143194b7a85ec760b4aa1ea94d00df9b050f
diff --git a/jenkins/gerrit-buck-bazel-plugin-plugin-manager.yaml b/jenkins/gerrit-buck-bazel-plugin-plugin-manager.yaml
index e4296b1..b02154f 100644
--- a/jenkins/gerrit-buck-bazel-plugin-plugin-manager.yaml
+++ b/jenkins/gerrit-buck-bazel-plugin-plugin-manager.yaml
@@ -6,7 +6,12 @@
             - stable-2.13
       - 'plugin-{name}-bazel-{branch}':
           branch:
-            - master
             - stable-2.16
             - stable-2.15
             - stable-2.14
+      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
+          branch:
+            - master
+          gerrit-branch:
+            - master
+            - stable-3.0