feat: DNS

Signed-off-by: Rémi Verchère <remi@verchere.fr>

content/posts/2021/2021-09-23-dns-01-challenge-wildcard-cert-kubernetes.md

@@ -121,7 +121,7 @@ So now we can see, using our preferred tool, the deployments and all the cert-ma
 
 Next, we have to create a certificate issuer, which will be responsible to request the TLS certificates. This is a Custom Resource, with the property “dns01”. We create a ClusterIssuer instead of Issuer to be able to manage certificates cluster-wide:
 
-```yaml
+```yaml {linenos=table}
 ---
 apiVersion: cert-manager.io/v1
 kind: ClusterIssuer