Helm: Add SAN to a certificate of liqo-metric-agent

Add SAN to a certificate since kube-apiserver keeps outputting like a following message if the cert have no SAN.

I1219 11:45:34.682981       1 server_cert_deprecations.go:68] missing-san.invalid-cert.kubernetes.io: invalid certificate detected connecting to "10.2.133.101": relies on a legacy Common Name field instead of the SAN extension for subject validation

deployments/liqo/templates/liqo-metric-agent-deployment.yaml

@@ -54,6 +54,8 @@ spec:
             - /certs/key.pem
             - -out
             - /certs/cert.pem
+            - -addext
+            - subjectAltName = DNS:{{ include "liqo.prefixedName" $metricConfig }}.{{ .Release.Namespace }}.svc
           resources: {{- toYaml .Values.metricAgent.pod.resources | nindent 12 }}
       containers:
         - image: {{ .Values.metricAgent.imageName }}{{ include "liqo.suffix" $metricConfig }}:{{ include "liqo.version" $metricConfig }}