Build groovy-provider against gerrit stable-3.6

Bug: Issue 15831
Change-Id: I2bdeda2be6670f8feee303ef9913b2734c8baf93
diff --git a/jenkins/gerrit-bazel-plugin-groovy-provider.yaml b/jenkins/gerrit-bazel-plugin-groovy-provider.yaml
index 76c6fa3..e61b9b1 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-3.6
             - stable-3.5
             - stable-3.4
             - stable-3.3