Build task plugin for Gerrit v3.{1,2}

Change-Id: I40c58a08f9b7d6179118e8c38dfeba9809cbca59
diff --git a/jenkins/gerrit-bazel-plugin-task.yaml b/jenkins/gerrit-bazel-plugin-task.yaml
index 17886a5..9c4665a 100644
--- a/jenkins/gerrit-bazel-plugin-task.yaml
+++ b/jenkins/gerrit-bazel-plugin-task.yaml
@@ -1,6 +1,13 @@
 - project:
     name: task
     jobs:
+      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
+          branch:
+            - master
+          gerrit-branch:
+            - master
+            - stable-3.1
+            - stable-3.2
       - 'plugin-{name}-bazel-{branch}':
           branch:
             - master