Re-enable RHEL 8 in CI (#1075)

* Re-enable RHEL 8 in CI.

* Skip podman on RHEL 8.

tests/integration/targets/setup_podman/vars/RedHat-8.yml

@@ -0,0 +1,9 @@
+---
+# Copyright (c) Ansible Project
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# While CentOS 8 has podman, there's a strange conflict resolution issue with it
+# TODO: try to fix that issue!
+has_podman: false
+podman_packages: []