Switch the docker image over to python 3.10

Python 3.10 has been quite a bit quicker than 3.8 with Zuul. With the
3.11 release coming up soon updating to 3.10 will allow us to drop the
3.8 docker images and take advantage of faster python.

We add python 3.10 unittesting to ensure we don't regress when making
changes.

Change-Id: I439027f6e2c6f2d01b4629351a4c72cc1892579a

.zuul.yaml

@@ -20,8 +20,8 @@
     description: Build OpenDev Docker images for storyboard webclient
     provides: gerritbot-container-image
     requires:
-      - python-builder-3.8-bullseye-container-image
-      - python-base-3.8-bullseye-container-image
+      - python-builder-3.10-bullseye-container-image
+      - python-base-3.10-bullseye-container-image
     required-projects: &gerritbot_opendev_required_projects
       - opendev/gerritlib
     vars: &gerritbot_opendev_image_vars
@@ -39,8 +39,8 @@
     description: Build OpenDev gerritbot Docker images and upload to Docker Hub.
     provides: gerritbot-container-image
     requires:
-      - python-builder-3.8-bullseye-container-image
-      - python-base-3.8-bullseye-container-image
+      - python-builder-3.10-bullseye-container-image
+      - python-base-3.10-bullseye-container-image
     required-projects: *gerritbot_opendev_required_projects
     vars: *gerritbot_opendev_image_vars
     secrets:
@@ -63,11 +63,15 @@
       jobs:
         - tox-pep8
         - tox-py38
+        - tox-py310:
+            nodeset: ubuntu-jammy
         - gerritbot-build-opendev-image
     gate:
       jobs:
         - tox-pep8
         - tox-py38
+        - tox-py310:
+            nodeset: ubuntu-jammy
         - gerritbot-upload-opendev-image
     promote:
       jobs:

Dockerfile

@@ -13,12 +13,12 @@
 # You should have received a copy of the GNU General Public License
 # along with this software.  If not, see <http://www.gnu.org/licenses/>.
 
-FROM opendevorg/python-builder:3.8-bullseye as builder
+FROM opendevorg/python-builder:3.10-bullseye as builder
 
 COPY . /tmp/src
 RUN assemble
 
-FROM opendevorg/python-base:3.8-bullseye as gerritbot
+FROM opendevorg/python-base:3.10-bullseye as gerritbot
 
 COPY --from=builder /output/ /output
 RUN /output/install-from-bindep

setup.cfg

@@ -14,6 +14,7 @@ classifier =
     Programming Language :: Python
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.10
 
 [entry_points]
 console_scripts =