Update the docker images to python 3.10

Do this to take advantage of python 3.10's speed improvements as
illustrated by Zuul proper. But als OpenDev is looking at dropping
python 3.8 image builds to make room for python 3.11.

Change-Id: I0bb4902d32003ab8e8fb35e6cc39e62ceed88aa8

.zuul.yaml

@@ -31,6 +31,8 @@
       - zuul-container-image
       - zuul-registry-container-image
       - nodepool-container-image
+      - python-builder-3.10-bullseye-container-image
+      - python-base-3.10-bullseye-container-image
     provides:
       - zuul-operator-container-image
     vars: &image_vars
@@ -75,6 +77,8 @@
       - nodepool-container-image
     provides:
       - zuul-operator-container-image
+      - python-builder-3.10-bullseye-container-image
+      - python-base-3.10-bullseye-container-image
     vars: *image_vars
 
 - job:

build/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 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
+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