Add requirements-tox-py311-check-uc job

Start checking requirements on python3.11 to get early warnings about
upcoming issues. Non-voting for now.

Change-Id: I7713029b95beb69d87f5cba66997fd4ba422c6b0

.zuul.d/jobs.yaml

@@ -42,6 +42,21 @@
     files: ^upper-constraints.*txt$
     vars:
       tox_envlist: py310-check-uc
+
+- job:
+    name: requirements-tox-py311-check-uc
+    # TODO: use the openstack-tox-py311 job as the parent
+    # when it becomes available in openstack/openstack-zuul-jobs
+    parent: openstack-tox
+    description: |
+      Run test for requirements project.
+
+      Uses tox with the ``py311-check-uc`` environment.
+    files: ^upper-constraints.*txt$
+    vars:
+      python_version: '3.11'
+      tox_envlist: py311-check-uc
+
 - job:
     name: requirements-tox-validate-projects
     parent: openstack-tox

.zuul.d/project.yaml

@@ -31,6 +31,8 @@
         - requirements-tox-py38-check-uc
         - requirements-tox-py39-check-uc
         - requirements-tox-py310-check-uc
+        - requirements-tox-py311-check-uc:
+            voting: false
         - requirements-tox-validate-projects:
             voting: false
         - cross-aodh-py310

tox.ini

@@ -35,6 +35,11 @@ basepython = python3.10
 deps = -r{toxinidir}/upper-constraints.txt
 commands = check-conflicts {toxinidir}/upper-constraints.txt {toxinidir}/upper-constraints-xfails.txt
 
+[testenv:py311-check-uc]
+basepython = python3.11
+deps = -r{toxinidir}/upper-constraints.txt
+commands = check-conflicts {toxinidir}/upper-constraints.txt {toxinidir}/upper-constraints-xfails.txt
+
 [testenv:venv]
 commands = {posargs}