ensure-dib: Add podman and rootlesskit

Without that containerfile element based builds are not working.

Skipping focal because rootlesskit does not exist there.

Change-Id: I4800d327529b3b8479b359080512af19fab226f3

roles/ensure-dib/tasks/main.yaml

@@ -29,11 +29,14 @@
 - name: Install dnf and dnf download
   when: ansible_distribution_release != "focal"
   block:
-    - name: Install dnf
+    - name: Install dnf and podman
       become: true
       package:
         state: present
-        name: dnf
+        name:
+          - dnf
+          - podman
+          - rootlesskit
 
     # There is a Debian package for dnf-plugins-core but it breaks and replaces
     # zypper which we also want to install. Prior to dnf-plugins-core existing