ci: build Python 3.11 docker image (#676)

Author: krishanbhasin-px

.github/workflows/docker.yml

@@ -19,6 +19,9 @@ jobs:
           - ubuntu: 22.04
             python: 3
             label: "3.10"
+          - ubuntu: 22.04
+            python: 3.11
+            label: 3.11
 
     # Start a local registry to which we will push trame-common, so that
     # docker buildx may access it in later steps.