Login with buildah too to allow registry access with buildah

buildah login and podman login with root do not share same
authfile, buildah uses /run/containers/0/auth.json while
podman uses /run/user/0/containers/auth.json resulted from
$XDG_RUNTIME_DIR.

To ensure both podman and buildah can access the configured
registry, run login command with both.

It's mainly needed as container images are being pushed
with tripleoclient using sudo buildah push and buildah creds
are not setup.

Related-Bug: #1886555
Change-Id: I3d38d406e9f63008f7060f31cc9ff378e97120bb
(cherry picked from commit 067a315df9)

tripleo_ansible/roles/tripleo_podman/tasks/tripleo_podman_login.yml

@@ -15,7 +15,7 @@
 # under the License.
 
 
-- name: Perform container registry login(s)
+- name: Perform container registry login(s) with podman
   become: true
   shell: |-
     podman login --username=$REGISTRY_USERNAME \
@@ -29,3 +29,18 @@
   no_log: "{{ tripleo_podman_hide_sensitive_logs | bool }}"
   loop: "{{ query('dict', tripleo_container_registry_logins) }}"
   register: registry_login_podman
+
+- name: Perform container registry login(s) with buildah
+  become: true
+  shell: |-
+    buildah login --username=$REGISTRY_USERNAME \
+                  --password=$REGISTRY_PASSWORD \
+                  --tls-verify={{ tripleo_podman_tls_verify }} \
+                  $REGISTRY
+  environment:
+    REGISTRY_USERNAME: "{{ lookup('dict', item.value).key }}"
+    REGISTRY_PASSWORD: "{{ lookup('dict', item.value).value }}"
+    REGISTRY: "{{ item.key }}"
+  no_log: "{{ tripleo_podman_hide_sensitive_logs | bool }}"
+  loop: "{{ query('dict', tripleo_container_registry_logins) }}"
+  register: registry_login_buildah

tripleo_ansible/roles/tripleo_podman/vars/redhat.yml

@@ -17,6 +17,7 @@
 
 _tripleo_podman_packages:
   - podman
+  - buildah
 
 _tripleo_podman_purge_packages:
   - docker