Build 'groovy-provider' master against Gerrit 'stable-3.7' branch

Change-Id: I4be619404ad473a4c2265ac338cc692eb585d7c1
diff --git a/jenkins/gerrit-bazel-plugin-groovy-provider.yaml b/jenkins/gerrit-bazel-plugin-groovy-provider.yaml
index 699ec7f..3cbdf99 100644
--- a/jenkins/gerrit-bazel-plugin-groovy-provider.yaml
+++ b/jenkins/gerrit-bazel-plugin-groovy-provider.yaml
@@ -10,4 +10,5 @@
           branch:
             - master
           gerrit-branch:
+            - stable-3.7
             - stable-3.6