Fix permissions on /etc for munge service

The munge service does not start if permissions on /etc are too wide:

    munged: Error: Keyfile is insecure: group-writable permissions without sticky bit set on "/etc"

Author: priteau

tasks/runtime.yml

@@ -103,6 +103,11 @@
   register: ohpc_cgroup_conf
   # NB uses restart rather than reload as this is needed in some cases
 
+- name: Fix permissions on /etc for Munge service
+  ansible.builtin.file:
+    mode: g-w
+    path: /etc
+
 - name: Ensure Munge service is running
   service:
     name: munge