Add python 3.12 testing to Zuul

We use pyenv to install python3.12 on ubuntu jammy (which doesn't have
native packages for this version of python). We don't update the
container images just yet as we want to build confidence through testing
before end users see the new python version in production.

Change-Id: I20a57f6d29699886867ce912e9943c59aa9963f4

.zuul.yaml

@@ -140,6 +140,16 @@
       nox_environment:
         ZUUL_SCHEDULER_COUNT: 2
 
+- job:
+    name: zuul-nox-py312
+    # This could probably use some refactoring to have a base unittest job
+    # that isn't python version specific.
+    parent: zuul-nox-py311
+    vars:
+      python_use_pyenv: true
+      nox_force_python: "3.12"
+      python_version: "3.12"
+
 - job:
     name: zuul-build-dashboard
     parent: build-javascript-deployment
@@ -361,6 +371,7 @@
             nodeset: ubuntu-jammy
         - zuul-nox-py311
         - zuul-nox-py311-multi-scheduler
+        - zuul-nox-py312
         - zuul-build-dashboard-openstack-whitelabel
         - zuul-build-dashboard-software-factory
         - zuul-build-dashboard-opendev
@@ -394,6 +405,7 @@
               nox_install_bindep: false
             nodeset: ubuntu-jammy
         - zuul-nox-py311
+        - zuul-nox-py312
         - zuul-build-dashboard
         - nodejs-run-lint:
             vars:

bindep.txt

@@ -30,6 +30,10 @@ libffi8 [platform:ubuntu-jammy platform:debian-bookworm]
 libffi7 [platform:ubuntu-focal platform:debian-bullseye]
 libffi6 [platform:dpkg !platform:ubuntu-focal !platform:ubuntu-jammy !platform:debian-bullseye !platform:debian-bookworm]
 libffi-devel [compile test platform:rpm]
+# These two compression libs are needed when installing python3.12 from
+# source using pyenv. We can drop them once we're using distro packages.
+liblzma-dev [test]
+libbz2-dev [test]
 libyaml-0-2 [platform:dpkg platform:suse]
 libyaml [platform:redhat]
 libyaml-dev [platform:dpkg compile test]

setup.cfg

@@ -15,6 +15,7 @@ classifier =
     Programming Language :: Python
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
 
 [pbr]
 warnerrors = True