Use explicit docker image sha.
Change-Id: I411697c58f97a7f9f15fd0f795c4cf7d328afe64
diff --git a/vars/functions.groovy b/vars/functions.groovy
index ac9ba79..e7a195b 100644
--- a/vars/functions.groovy
+++ b/vars/functions.groovy
@@ -140,7 +140,7 @@
def jnlpContainer = containerTemplate(name: 'jnlp',
image: 'jenkins/jnlp-slave:alpine')
def debianContainer = containerTemplate(name: 'debian',
- image: 'gcr.io/mendel-linux-cloud-infra/mendel-builder:latest',
+ image: 'gcr.io/mendel-linux-cloud-infra/mendel-builder@sha256:30f5a2b1b85e678fc25d4322226a55e571ee7a4c344a35d1b13c3e496d4bbe3f',
command: 'cat',
args: '',
ttyEnabled: true,