Add job for openstack-python3-victoria-jobs-arm64

This run openstack-python3-victoria-jobs template with arm64
nodeset.

This template currently runs only a non-voting job
`openstack-tox-py38-arm64`.

Change-Id: If2259fdad175456432a46b9d859ddbd484d81f18
Task: #40398

zuul.d/jobs.yaml

@@ -172,6 +172,18 @@
       bindep_profile: test py38
       python_version: 3.8
 
+- job:
+    name: openstack-tox-py38-arm64
+    parent: openstack-tox-py38
+    nodeset: ubuntu-bionic-arm64
+    timeout: 3600
+    description: |
+
+      Run unit tests for an OpenStack Python project under cPython
+      version 3.8 on top of arm64 architecture.
+
+      Uses tox with the ``py38`` environment in arm64 platform.
+
 - job:
     name: openstack-tox-pypy
     parent: openstack-tox

zuul.d/project-templates.yaml

@@ -495,6 +495,19 @@
       jobs:
         - publish-openstack-python-branch-tarball
 
+- project-template:
+    name: openstack-python3-victoria-jobs-arm64
+    description: |
+      Runs unit tests for an OpenStack Python project under the CPython
+      version 3 releases designated for testing in the Victoria release
+      on top of ARM64 architecture. This currently runs only a limited
+      test set and supplements the python3-victoria-jobs. And it should
+      not be run instead of the default!
+    check-arm64:
+      jobs:
+        - openstack-tox-py38-arm64:
+            voting: false
+
 - project-template:
     name: openstack-python3-victoria-jobs-horizon
     description: |