Add a unit test job with Sushy from source

The final goal is to run it on sushy itself to make sure there are
no regressions.

Change-Id: I6f4bee9a3fa439b1477c41c82304652a801ea55e

zuul.d/ironic-jobs.yaml

@@ -1043,3 +1043,27 @@
             EBTABLES_RACE_FIX: True
             LIBVIRT_STORAGE_POOL_PATH: /opt/libvirt/images
             IRONIC_VM_LOG_DIR: '/opt/stack/ironic-bm-logs'
+
+- job:
+    name: ironic-cross-sushy
+    description: Ironic unit tests run with Sushy from source
+    parent: openstack-tox
+    required-projects:
+      - opendev.org/openstack/ironic
+      - opendev.org/openstack/sushy
+    irrelevant-files:
+      - ^.*\.rst$
+      - ^api-ref/.*$
+      - ^devstack/.*$
+      - ^doc/.*$
+      - ^releasenotes/.*$
+      - ^tools/.*$
+    vars:
+      # NOTE(dtantsur): change this every release cycle if needed.
+      bindep_profile: test py38
+      tox_envlist: py38
+      # This variable ensures that sushy is installed from source.
+      tox_install_siblings: true
+      # NOTE(dtantsur): this job will be run on sushy as well, so it's
+      # important to set the working dir to the Ironic checkout.
+      zuul_work_dir: "{{ ansible_user_dir }}/{{ zuul.projects['opendev.org/openstack/ironic'].src_dir }}"

zuul.d/project.yaml

@@ -11,6 +11,8 @@
     check:
       jobs:
         - ironic-tox-unit-with-driver-libs
+        - ironic-cross-sushy:
+            voting: false
         - ironic-tempest-functional-python3
         - ironic-tempest-functional-rbac-scope-enforced
         - ironic-grenade