scripts/ci: support CentOS Stream 8 in build-environment.yaml

Update the CI playbook so that it is able to prepare a system with a
fresh CentOS Stream 8 install, rather than just support RHEL.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

scripts/ci/setup/build-environment.yml

@@ -130,6 +130,16 @@
         - ansible_facts['distribution_version'] == '20.04'
         - ansible_facts['architecture'] == 'aarch64'
 
+    - name: Enable PowerTools repo on CentOS 8
+      ini_file:
+        path: /etc/yum.repos.d/CentOS-Stream-PowerTools.repo
+        section: powertools
+        option: enabled
+        value: "1"
+      when:
+        - ansible_facts['distribution_file_variety'] == 'CentOS'
+        - ansible_facts['distribution_major_version'] == '8'
+
     - name: Install basic packages to build QEMU on EL8
       dnf:
         # This list of packages start with tests/docker/dockerfiles/centos8.docker
@@ -164,7 +174,7 @@
           - zlib-devel
         state: present
       when:
-        - ansible_facts['distribution_file_variety'] == 'RedHat'
+        - ansible_facts['distribution_file_variety'] in ['RedHat', 'CentOS']
         - ansible_facts['distribution_version'] == '8'
 
     - name: Install packages only available on x86 and aarch64
@@ -174,6 +184,6 @@
           - spice-server
         state: present
       when:
-        - ansible_facts['distribution_file_variety'] == 'RedHat'
+        - ansible_facts['distribution_file_variety'] in ['RedHat', 'CentOS']
         - ansible_facts['distribution_version'] == '8'
         - ansible_facts['architecture'] == 'aarch64' or ansible_facts['architecture'] == 'x86_64'