Fixing image builder jobs on Red Hat based distros

Enabling SELinux on Centos 9 Stream prevents diskimage-builder from
creating a RPM DB dir in a chroot. Disable SELinux when building amphora
images on Red Hat distros.

Change-Id: I627dc7471b641fa726e00a8b5de61d9da0b7b308

playbooks/image-build/run.yaml

@@ -1,5 +1,13 @@
 - hosts: all
   tasks:
+    # Workaround for Red Hat like distros: SELinux prevents diskimage-builder
+    # from creating a RPM DB dir in a chroot on Centos 9 Stream
+    - name: Disable SELinux on Red Hat distributions
+      selinux:
+        state: disabled
+      become: yes
+      when:
+        - ansible_os_family == 'RedHat'
     - name: Install apt packages
       apt:
         pkg: "{{ item }}"