feat: uniform system.content source schema across installers and repositories

roles/bootstrap/tasks/rhel.yml

@@ -24,12 +24,14 @@
         - "'grub2-common' not in (bootstrap_result.stderr | default(''))"
 
     - name: Ensure chroot RHEL DVD directory exists
+      when: system_cfg.content.source != 'mirror'
       ansible.builtin.file:
         path: /mnt/usr/local/install/redhat/dvd
         state: directory
         mode: "0755"
 
     - name: Bind mount RHEL DVD into chroot
+      when: system_cfg.content.source != 'mirror'
       ansible.posix.mount:
         src: /usr/local/install/redhat/dvd
         path: /mnt/usr/local/install/redhat/dvd