docker_*: enable RHEL8 tests (#53313)

test/integration/targets/setup_docker/tasks/RHEL8.yml

@@ -0,0 +1,25 @@
+# The RHEL extras repository must be enabled to provide the container-selinux package.
+# See: https://docs.docker.com/engine/installation/linux/docker-ee/rhel/#install-using-the-repository
+
+- name: Install Docker pre-reqs
+  dnf:
+    name:
+    - dnf-utils
+    - device-mapper-persistent-data
+    - lvm2
+    - libseccomp
+    state: present
+
+- name: Set-up repository
+  command: dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
+
+- name: Install docker
+  dnf:
+    name: docker-ce
+    state: present
+
+- name: Make sure the docker daemon is running (failure expected inside docker container)
+  service:
+    name: docker
+    state: started
+  ignore_errors: "{{ ansible_virtualization_type == 'docker' }}"

test/integration/targets/setup_docker/tasks/main.yml

@@ -2,13 +2,16 @@
     is_rhel: "{{ ansible_os_family == 'RedHat' and ansible_distribution != 'Fedora' }}"
     is_rhel6: "{{ is_rhel and ansible_distribution_major_version == '6' }}"
     is_rhel7: "{{ is_rhel and ansible_distribution_major_version == '7' }}"
+    is_rhel8: "{{ is_rhel and ansible_distribution_major_version == '8' }}"
   block:
     - include_tasks: "{{ lookup('first_found', params) }}"
       vars:
         params:
           - '{{ ansible_distribution }}.yml'
           - '{{ ansible_os_family }}.yml'
-      when: not is_rhel6
+      when: not is_rhel6 and not is_rhel8
+    - include_tasks: RHEL8.yml
+      when: is_rhel8
 
     - name: Install Python requirements
       vars: