copy service account key logic
diff --git a/tools/jenkins/grpc_interop_node/build_interop.sh b/tools/jenkins/grpc_interop_node/build_interop.sh
index 55e2a40..84e25e3 100755
--- a/tools/jenkins/grpc_interop_node/build_interop.sh
+++ b/tools/jenkins/grpc_interop_node/build_interop.sh
@@ -34,6 +34,9 @@
mkdir -p /var/local/git
git clone --recursive /var/local/jenkins/grpc /var/local/git/grpc
+# copy service account keys if available
+cp -r /var/local/jenkins/service_account $HOME || true
+
cd /var/local/git/grpc
nvm use 0.12
nvm alias default 0.12 # prevent the need to run 'nvm use' in every shell