Include ansible centos repo link and install the latest ansible

Instead of sourcing ansible from epel or extras, we'll now use the
official Ansible repo

installer/image_build/tasks/main.yml

@@ -160,6 +160,18 @@
     dest: "{{ docker_base_path }}/Makefile"
   delegate_to: localhost
 
+- name: State ansible repo
+  copy:
+    src: 'ansible.repo'
+    dest: '{{ docker_base_path }}/ansible.repo'
+  delegate_to: localhost
+
+- name: State ansible repo key
+  copy:
+    src: 'RPM-GPG-KEY-ansible-release'
+    dest: '{{ docker_base_path }}/RPM-GPG-KEY-ansible-release'
+  delegate_to: localhost
+
 - name: Build base web image
   docker_image:
     buildargs: