Add mirror_info.sh creation for supplemental node repo setup

As discussed in related-bug the supplemental node used in the IPA
jobs is not using the mirror_info.sh so not using mirrors in the
repos created by repo-setup. This adds a slurp to grab the mirrors
config from the undercloud before repo-setup on supplemental.
Test and results at [1].

[1] https://review.rdoproject.org/r/c/testproject/+/40286/1#message-f825e6369163ad1f5aa98eb7c6c67b2798d5788b
Related-Bug: 1964457
Change-Id: I7b3c6f0a3b9fa7114670656df7b39cef8047fd85

playbooks/baremetal-full-freeipa.yml

@@ -29,6 +29,29 @@
     - freeipa-setup
   tasks:
 
+    - name: Create /etc/ci directory for supplemental
+      become: true
+      file:
+        path: /etc/ci
+        state: directory
+        owner: root
+        group: root
+        mode: 0755
+
+    - name: Slurp the contents of mirror_info.sh from undercloud
+      become: true
+      slurp:
+        src: '/etc/ci/mirror_info.sh'
+      register: mirror_info_sh
+      delegate_to: undercloud
+
+    - name: Write mirror_info.sh contents to file on supplemental
+      become: true
+      copy:
+        dest: '/etc/ci/mirror_info.sh'
+        content: |
+          {{ mirror_info_sh['content'] | b64decode }}
+
     - include_role:
         name: repo-setup
       vars: