feat(alertmanager_receiver): add role

roles/alertmanager_receiver/tasks/check.yml

@@ -0,0 +1,28 @@
+---
+- name: Ensure valid alertmanager_receiver_state
+  ansible.builtin.fail:
+    msg: >-2
+      Unsupported value '{{ alertmanager_receiver_state }}' for
+      alertmanager_receiver_state. Supported values are
+      {{ alertmanager_receiver_states | map(quote) | join(', ')
+  when: alertmanager_receiver_state not in alertmanager_receiver_states
+
+- name: Ensure valid alertmanager_receiver_deployment_method
+  ansible.builtin.fail:
+    msg: >-2
+      Unsupported value '{{ alertmanager_receiver_deployment_method }}' for
+      alertmanager_receiver_deployment_method. Supported values are
+      {{ alertmanager_receiver_deployment_methods | map(quote) | join(', ')
+  when: alertmanager_receiver_deployment_method not in alertmanager_receiver_deployment_methods
+
+- name: Ensure role fails when required configuration is missing
+  ansible.builtin.fail:
+    msg: >-2
+      Required configuration key '{{ _config_key }}' is undefined
+  when: hostvars[inventory_hostname][_config_key] is undefined
+  loop:
+    - "alertmanager_receiver_config_matrix_homeserver_url"
+    - "alertmanager_receiver_config_matrix_user_id"
+    - "alertmanager_receiver_config_matrix_access_token"
+  loop_control:
+    loop_var: "_config_key"