Add test for k8s cluster

tests/test-k8s-cluster.yml

+---
+- hosts: localhost
+  connection: local
+  remote_user: root
+  tasks:
+  - name: Download paas-ci role
+    local_action: command ansible-galaxy install git+https://baltig.infn.it/infn-cloud/paas-ci.git
+    changed_when: false
+
+  - include_role:
+      name: paas-ci
+    vars:
+      paas_ci_test:
+        template_url: https://baltig.infn.it/infn-cloud/tosca-templates/-/raw/master/kubernetes/k8s_cluster.yaml
+        inputs: |
+          '{ "admin_token": "hjli78hdakgb22as0", "users": [{"os_user_add_to_sudoers": true, "os_user_name": "scans", "os_user_ssh_public_key": "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCmQvE3sXtg4D/KYzhCdP6cICvy5foeSkHenKTisxdGJK8L0cDmV+4k7fIah1GIXrldjQBGWHSTbIj1qRTXG2OPWFxeDoXIN1FyKxwdOgwIfzIRtVq18VZEqt9eOiNUXN8jGoEAgcU7obqXuPqKAndk4tyOnSDuVnfnZWAiesVvWK16GEq0PAxBhJoX3eq501ilsNnJZDMEnvQEgtFuIbADEanrhRV3yaEca+9vFyOQRkyxDF8Gn6P/wZ4oe35bdgXxi/hg8JVKYbDCLlT+Fdi+OC3trRhwCcBSvDFD0ZQ8oLemzUk+732TqR+I8gVjPE9fiNF+/mrj5OX55SDr8Qgf scans"}]}'
+        endpoints_to_scan: |
+          k8s_endpoint,grafana_endpoint
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