Add stable-3.2 to its-phabricator

Change-Id: I20f45f8f2937acb282a11ba127b5e314236ab73b
diff --git a/jenkins/gerrit-bazel-plugin-its-phabricator.yaml b/jenkins/gerrit-bazel-plugin-its-phabricator.yaml
index eaca5a5..7730926 100644
--- a/jenkins/gerrit-bazel-plugin-its-phabricator.yaml
+++ b/jenkins/gerrit-bazel-plugin-its-phabricator.yaml
@@ -3,6 +3,7 @@
     jobs:
       - 'plugin-its-{name}-bazel-{branch}':
           branch:
+            - stable-3.2
             - stable-3.1
             - stable-3.0
             - stable-2.16