Merge pull request kubernetes#244 from munnerz/enable-dco

Enable DCO sign off checker for test-infra and cert-manager

Author: munnerz

Diff for: prow/cluster/hook_deployment.yaml

@@ -34,7 +34,9 @@ spec:
       terminationGracePeriodSeconds: 180
       containers:
       - name: hook
-        image: gcr.io/k8s-prow/hook:v20180809-c43e4c545
+        # Using a custom image that include the DCO sign-off checker plugin
+        # until https://github.com/kubernetes/test-infra/pull/9197 merges.
+        image: eu.gcr.io/jetstack-build-infra/hook:20180829-0d352ed-dco
         imagePullPolicy: Always
         args:
         - --dry-run=false

Diff for: prow/plugins.yaml

@@ -86,7 +86,7 @@ plugins:
   - assign
   - hold
   - label
-
+  - dco
 
   jetstack/cert-manager:
   - docs-no-retest
@@ -108,6 +108,7 @@ plugins:
   - yuks
   - wip
   - shrug
+  - dco
 
   jetstack/kube-lego:
   - docs-no-retest