roles: use alternate set of images for CentOS

CentOS AH is missing the Red Hat CA cert, so it is unable to pull
images from the registry (see:  CentOS/sig-atomic-buildscripts#329).
To workaround this, we'll have to build the list of images to pull
differently for CentOS vs. the rest.

roles/podman_pull_run_remove/tasks/main.yml

@@ -16,6 +16,14 @@
   register: podman
   ignore_errors: true
 
+- when: ansible_distribution != 'CentOS'
+  set_fact:
+    pull_images: "{{ popular_images | combine(rhel_images) }}"
+
+- when: ansible_distribution == 'CentOS'
+  set_fact:
+    pull_images: "{{ popular_images }}"
+
 - when: podman.rc == 0
   block:
     - name: Disable the docker daemon
@@ -25,30 +33,30 @@
 
     - name: Pull the popular container images
       command: "podman pull {{ item.key }}"
-      with_dict: "{{ popular_images }}"
+      with_dict: "{{ pull_images }}"
       register: podman_pull
       retries: 5
       delay: 60
       until: podman_pull is success
 
     - name: Run the popular container images
       command: "podman run --rm {{ item.key }} echo 'hello'"
-      with_dict: "{{ popular_images }}"
+      with_dict: "{{ pull_images }}"
 
     # Test for https://bugzilla.redhat.com/show_bug.cgi?id=1585735
     - name: Run the popular container images with cpu-shares flag
       command: "podman run --cpu-shares 2 --rm {{ item.key }} echo 'hello'"
-      with_dict: "{{ popular_images }}"
+      with_dict: "{{ pull_images }}"
 
     # Test for https://bugzilla.redhat.com/show_bug.cgi?id=1592932
     #          https://bugzilla.redhat.com/show_bug.cgi?id=1593419
     - name: Run the popular container images testing for network access
       command: "podman run --rm {{ item.key }} {{ item.value }}"
-      with_dict: "{{ popular_images }}"
+      with_dict: "{{ pull_images }}"
 
     - name: Remove the popular container images
       command: "podman rmi {{ item.key }}"
-      with_dict: "{{ popular_images }}"
+      with_dict: "{{ pull_images }}"
 
     - name: Re-enable docker
       service:

roles/podman_pull_run_remove/vars/main.yml

@@ -7,4 +7,6 @@ popular_images:
   docker.io/ubuntu: 'bash -c "apt-get update && apt-get -y install iputils-ping && ping -c 3 1.1.1.1"'
   registry.fedoraproject.org/fedora: 'bash -c "dnf -y install iputils && ping -c 3 1.1.1.1"'
   registry.centos.org/centos/centos: 'ping -c 3 1.1.1.1'
+
+rhel_images:
   registry.access.redhat.com/rhel: 'curl --fail -o /dev/null -I https://1.1.1.1'