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/utils/cert-checker/config.tf

@@ -0,0 +1,10 @@
+locals {
+  app_version = var.tag
+  workdir     = "${var.persistent_folder}/cert-checker"
+  commands = [
+    "python -m venv /tmp/venv",
+    ". /tmp/venv/bin/activate",
+    "pip install -r /config/requirements.txt",
+    "python /config/check.py"
+  ]
+}