[CI] Add sqlalchemy 2.0 unit testing

Change-Id: I9a6ea8e18152ab9e2c26bfd68fa4129c01bc312f

zuul.d/ironic-inspector-jobs.yaml

@@ -47,6 +47,24 @@
         ironic-inspector: True
         ironic-inspector-dhcp: True
 
+# TODO(stephenfin): Remove this when we raise the upper-constraint globally
+- job:
+    name: ironic-inspector-tox-unit-with-sqlalchemy-2x
+    parent: openstack-tox
+    description: |
+      Run unit tests with main branch of SQLAlchemy, alembic and oslo.db.
+      Takes advantage of the base tox job's install-siblings feature.
+    vars:
+      tox_envlist: py3
+    # The job only tests the latest and shouldn't be run on the stable branches
+    branches: ^master$
+    required-projects:
+      - name: github.com/sqlalchemy/sqlalchemy
+        override-checkout: main
+      - name: github.com/sqlalchemy/alembic
+        override-checkout: main
+      - name: openstack/oslo.db
+
 - job:
     name: ironic-inspector-tempest-managed-non-standalone
     description: The boot is managed by ironic, ironic-inspector runs in non-standalone mode.

zuul.d/project.yaml

@@ -7,6 +7,7 @@
       - release-notes-jobs-python3
     check:
       jobs:
+        - ironic-inspector-tox-unit-with-sqlalchemy-2x
         - ironic-inspector-grenade
         - ironic-inspector-tempest
         - ironic-inspector-tempest-discovery
@@ -17,6 +18,7 @@
             voting: false
     gate:
       jobs:
+        - ironic-inspector-tox-unit-with-sqlalchemy-2x
         - ironic-inspector-grenade
         - ironic-inspector-tempest
         - ironic-inspector-tempest-discovery