Build groovy-provider plugin on stable-3.4 branch

Change-Id: Id24ba186b0d9985ff0118bd1dd31cf5d8a413372
diff --git a/jenkins/gerrit-bazel-plugin-groovy-provider.yaml b/jenkins/gerrit-bazel-plugin-groovy-provider.yaml
index e3a74f5..0cecfe3 100644
--- a/jenkins/gerrit-bazel-plugin-groovy-provider.yaml
+++ b/jenkins/gerrit-bazel-plugin-groovy-provider.yaml
@@ -8,6 +8,7 @@
           branch:
             - master
           gerrit-branch:
+            - stable-3.4
             - stable-3.3
             - stable-3.2
             - stable-3.1