Install ironic-staging-drivers in ironic-conductor

The Ironic Staging Drivers is used to hold out-of-tree
Ironic drivers such as the oVirt driver.

Related-Bug: rhbz#1646641
Change-Id: I92796be5b48d4ec8972851b6010279f42c0065ee
(cherry picked from commit c6fab39066)

container-images/tripleo_kolla_template_overrides.j2

@@ -47,6 +47,9 @@ gpgcheck=0' >> /etc/yum.repos.d/opendaylight.repo
 # container image operations during overcloud deploy
 {% set mistral_executor_packages_append = ['openstack-tripleo-validations', 'openstack-nova-common', 'docker', 'podman'] %}
 
+# Include the ironic-staging-drivers
+{% set ironic_conductor_packages_append = ['openstack-ironic-staging-drivers'] %}
+
 # FIXME (kolla review to add ceilometer to swift proxy image)
 # NOTE (jaosorior): swift proxy with TLS everywhere needs these packages.
 # NOTE(mandre) Apache cleanup done below in swift_proxy_server_footer block

releasenotes/notes/append-ironic-staging-drivers-d278905bb1ec0683.yaml

@@ -0,0 +1,9 @@
+---
+features:
+  - |
+    The ``ironic-staging-drivers`` are now installed in the ironic-conductor
+    container so that these drivers can be used without rebuilding the
+    container. The `Ironic Staging Drivers
+    <https://ironic-staging-drivers.readthedocs.io/en/latest/>`_ is used to
+    hold out-of-tree Ironic drivers which doesn't have means to provide a 3rd
+    Party CI at this point in time which is required by Ironic.