Build go-import plugin on stable-3.0

Change-Id: I85aadd2eab9e8394de77e499a7b5b1f0d90620be
diff --git a/jenkins/gerrit-buck-bazel-plugin-go-import.yaml b/jenkins/gerrit-buck-bazel-plugin-go-import.yaml
index efd0a6e..bea9e92 100644
--- a/jenkins/gerrit-buck-bazel-plugin-go-import.yaml
+++ b/jenkins/gerrit-buck-bazel-plugin-go-import.yaml
@@ -7,6 +7,7 @@
       - 'plugin-{name}-bazel-{branch}':
           branch:
             - master
+            - stable-3.0
             - stable-2.16
             - stable-2.15
             - stable-2.14