Fix knightly pipeline

This PR is the combination of !23 (closed) !27 (closed) !28 (closed). Since the three PR is kind of in a circular dependency and hard to integrate and debug. So I create this new PR to make it easier.

ansible/roles/compute_packages/tasks/main.yml

----
-# tasks file for cheaha.packages
-- name: Install prerequisite packages
-  yum:
-    name: epel-release
-    state: present
-
-- name: Copy yum repo files into place
-  ansible.builtin.copy:
-    src: "{{ item }}"
-    dest: "/etc/yum.repos.d/{{ item }}"
-    owner: root
-    group: root
-    mode: 0644
-  loop:
-    - cm.repo
-    - ceph.repo
-    - dell-system-update.repo
-    - elastic.repo
-    - nux-dextop.repo
-    - TurboVNC.repo
-
-- name: Copy CM repo GPG key
-  ansible.builtin.copy:
-    src: RPM-GPG-KEY-cm
-    dest: /etc/pki/rpm-gpg/RPM-GPG-KEY-cm
-    owner: root
-    group: root
-    mode: 0644
-
-- name: Install openstack-rocky repo
-  ansible.builtin.yum:
-    name: centos-release-openstack-rocky
-    state: present
-
-- name: Install required packages
-  yum:
-    name:
-      - slurm-client-18.08.9
-      - munge-0.5.13
-      - openldap-servers-2.4.48
-      - Lmod-7.7.14
-      - cm-modules-init-client-8.2
-      - cmdaemon
-      - nss-pam-ldapd
-      - ruby
-      - python3
-    state: present
-
-- name: Install system packages
-  ansible.builtin.yum:
-    name: "{{ lookup('file', '{{ pkg_list_file }}').splitlines() }}"
-    state: present