scale down linux agents as we run them on LLVM cluster

gcloud_config.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+set -uo pipefail
+gcloud config set project ${GCP_PROJECT}
+gcloud config set compute/zone ${GCP_ZONE}
+gcloud auth configure-docker
+gcloud container clusters get-credentials $GCP_CLUSTER
+

kubernetes/buildkite/linux-agents.yaml

@@ -18,7 +18,7 @@ metadata:
   name: linux-agents
   namespace: buildkite
 spec:
-  replicas: 5
+  replicas: 0
   strategy:
     rollingUpdate:
       maxSurge: 25%