Import %workspace%/.bazelrc when using a custom bazelrc file

Tensorflow put --action_env options in bazelrc file, we must not ignore
them when using a new bazelrc file.

Change-Id: I33851989c7130ba52b2652d12370bd04ca154fb8
diff --git a/jenkins/github-jobs.sh.tpl b/jenkins/github-jobs.sh.tpl
index 9ca41b0..32a4ae5 100644
--- a/jenkins/github-jobs.sh.tpl
+++ b/jenkins/github-jobs.sh.tpl
@@ -35,7 +35,9 @@
   BUILD_TAG_FILTERS="-jdk8"
 fi
 
+touch .bazelrc
 cat >${ROOT}/bazel.bazelrc <<EOF
+import %workspace%/.bazelrc
 build {{ variables.BUILD_OPTS }}
 test {{ variables.TEST_OPTS }}
 test --test_tag_filters ${TEST_TAG_FILTERS}