Update docker images to python 3.10

We do this for two reasons. The first is that Zuul proper has shown
python 3.10 is a bit quicker than 3.8 and we should take advantage of
that. The second is OpenDev would like to drop image builds for python
3.8 to make room for the upcoming release of python 3.11.

Note we add python 3.10 testing to ensure we don't regress the images by
making this change.

Change-Id: I3630c376cef775ce622618bf5f6e59cf62c4f492

.zuul.yaml

@@ -21,8 +21,8 @@
     allowed-projects: zuul/zuul-client
     timeout: 2700
     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
     provides:
       - zuul-client-container-image
     vars: &zuulclient_image_vars
@@ -38,8 +38,8 @@
     description: Build the CLI Docker image and upload to Docker Hub.
     timeout: 3600
     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
     provides: zuul-client-container-image
     vars: *zuulclient_image_vars
     secrets:
@@ -74,6 +74,9 @@
         - tox-py38:
             nodeset: ubuntu-bionic
             timeout: 3600
+        - tox-py310:
+            nodeset: ubuntu-jammy
+            timeout: 3600
         - zuul-tox-zuul-client
         - build-python-release
     gate:
@@ -88,6 +91,9 @@
         - tox-py38:
             nodeset: ubuntu-bionic
             timeout: 3600
+        - tox-py310:
+            nodeset: ubuntu-jammy
+            timeout: 3600
         - zuul-tox-zuul-client
         - build-python-release
         - zuul-client-upload-image

Dockerfile

@@ -13,12 +13,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM docker.io/opendevorg/python-builder:3.8-bullseye as builder
+FROM docker.io/opendevorg/python-builder:3.10-bullseye as builder
 
 COPY . /tmp/src
 RUN assemble
 
-FROM docker.io/opendevorg/python-base:3.8-bullseye
+FROM docker.io/opendevorg/python-base:3.10-bullseye
 
 COPY --from=builder /output/ /output
 RUN /output/install-from-bindep

setup.cfg

@@ -30,6 +30,7 @@ classifier =
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3 :: Only
     Topic :: Software Development :: Quality Assurance
     Topic :: Software Development :: Testing