feat(cert-checker): add Kubernetes resources for certificate checking functionality

- Implemented a new module for cert-checker with Kubernetes resources including ServiceAccount, Role, RoleBinding, ConfigMap, and CronJob.
- Added Python script to check certificate expiry and restart deployments if necessary.
- Configured environment variables for deployment name, namespace, and service details.
- Included requirements for the Python environment.

feat(devolo-exporter): introduce Devolo exporter for Prometheus metrics

- Created a new module for Devolo exporter with Kubernetes resources including ServiceAccount, ConfigMap, Deployment, and Service.
- Developed Python scripts to scrape metrics from Devolo devices and expose them to Prometheus.
- Configured environment variables for Devolo device IP, model, and ports.
- Added requirements for the Python environment.

terraform/modules/apps/mail/main.tf

@@ -56,7 +56,7 @@ resource "kubernetes_manifest" "mail_certificate" {
 }
 
 module "cert_checker" {
-  source            = "../../utils/cert_checker"
+  source            = "../../utils/cert-checker"
   namespace         = kubernetes_namespace.mail.metadata[0].name
   persistent_folder = local.mail_path
   deployments       = local.deployments