allow adding additional dnf repo changes (#744)

Author: sjpb

ansible/roles/dnf_repos/defaults/main.yml

@@ -47,7 +47,8 @@ dnf_repos_openhpc_repolist:
   file: OpenHPC
   base_url: "{{ dnf_repos_pulp_content_url }}/{{ appliances_pulp_repos.openhpc_updates[ansible_distribution_major_version] | appliances_repo_to_subpath }}"
 
-dnf_repos_repolist: "{{ dnf_repos_default_repolist + (dnf_repos_openhpc_repolist if (openhpc_install_type | default('ohpc')) == 'ohpc' else []) }}"
+dnf_repos_extra_repolist: []
+dnf_repos_repolist: "{{ dnf_repos_default_repolist + (dnf_repos_openhpc_repolist if (openhpc_install_type | default('ohpc')) == 'ohpc' else []) + dnf_repos_extra_repolist }}"
 
 dnf_repos_epel_baseurl: "{{ dnf_repos_pulp_content_url }}/{{ appliances_pulp_repos.epel[ansible_distribution_major_version] | appliances_repo_to_subpath }}"
 dnf_repos_epel_description: "epel"