ensure-podman: support Debian bullseye

The package is included in the latest stable, Debian bullseye.  Add an
install match, and test it.

Change-Id: I62d2582e8adf2bedb2ea7d41b4b22a48c9b2f274

roles/ensure-podman/tasks/Debian.yaml

@@ -0,0 +1,8 @@
+- name: Install podman
+  package:
+    name:
+      - podman
+      - uidmap
+      - slirp4netns
+    state: present
+  become: yes

zuul-tests.d/container-roles-jobs.yaml

@@ -432,6 +432,15 @@
         - name: ubuntu-focal
           label: ubuntu-focal
 
+- job:
+    name: zuul-jobs-test-ensure-podman-debian-bullseye
+    description: Tests ensure-podman role on debian-bullseye
+    parent: zuul-jobs-test-ensure-podman
+    nodeset:
+      nodes:
+        - name: debian-bullseye
+          label: debian-bullseye
+
 - job:
     name: zuul-jobs-test-ensure-skopeo-centos-8
     description: Tests ensure-skopeo role on centos-8
@@ -498,6 +507,7 @@
         - zuul-jobs-test-ensure-podman-fedora-34
         - zuul-jobs-test-ensure-podman-ubuntu-bionic
         - zuul-jobs-test-ensure-podman-ubuntu-focal
+        - zuul-jobs-test-ensure-podman-debian-bullseye
         - zuul-jobs-test-ensure-skopeo-centos-8
         - zuul-jobs-test-ensure-skopeo-fedora-34
         - zuul-jobs-test-ensure-skopeo-ubuntu-bionic
@@ -525,6 +535,7 @@
         - zuul-jobs-test-ensure-podman-centos-8-stream
         - zuul-jobs-test-ensure-podman-ubuntu-bionic
         - zuul-jobs-test-ensure-podman-ubuntu-focal
+        - zuul-jobs-test-ensure-podman-debian-bullseye
         - zuul-jobs-test-ensure-skopeo-centos-8
         - zuul-jobs-test-ensure-skopeo-fedora-34
         - zuul-jobs-test-ensure-skopeo-ubuntu-bionic