Update project to use Ubuntu 22.04 LTS

Ubuntu 22.04 LTS is not yet released, but it's already available to use. We can
start allowing testing this image internally before upgrading production
servers.

Also note that the default Python version was upgraded from 3.8 to 3.10.

Author: humitos

.circleci/config.yml

@@ -6,7 +6,7 @@ orbs:
 jobs:
   tests:
     docker:
-      - image: 'cimg/python:3.8'
+      - image: 'cimg/python:3.10'
         environment:
           TOX_POSARGS: ''
       - image: 'docker.elastic.co/elasticsearch/elasticsearch:7.14.0'
@@ -19,12 +19,12 @@ jobs:
       - run: git submodule sync
       - run: git submodule update --init
       - run: pip install --user tox
-      - run: tox -e py38
+      - run: tox -e py310
       - codecov/upload
 
   tests-embedapi:
     docker:
-      - image: 'cimg/python:3.8'
+      - image: 'cimg/python:3.10'
     steps:
       - checkout
       - run: git submodule sync
@@ -34,7 +34,7 @@ jobs:
 
   checks:
     docker:
-      - image: 'cimg/python:3.8'
+      - image: 'cimg/python:3.10'
         environment:
           NODE_VERSION: 10.17.0
     steps:

dockerfiles/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:20.04
+FROM ubuntu:22.04
 
 ARG GITHUB_USER
 ARG GITHUB_TOKEN

docs/dev/install.rst

@@ -133,7 +133,7 @@ save some work while typing docker compose commands. This section explains these
 ``inv docker.test``
     Runs all the test suites inside the container.
 
-    * ``--arguments`` will pass arguments to Tox command (e.g. ``--arguments "-e py38 -- -k test_api"``)
+    * ``--arguments`` will pass arguments to Tox command (e.g. ``--arguments "-e py310 -- -k test_api"``)
 
 ``inv docker.pull``
     Downloads and tags all the Docker images required for builders.

docs/dev/tests.rst

@@ -46,16 +46,16 @@ To target a specific environment:
 
 .. prompt:: bash
 
-   tox -e py38
+   tox -e py310
 
 The ``tox`` configuration has the following environments configured. You can
 target a single environment to limit the test suite:
 
-py38
-    Run our test suite using Python 3.8
+py310
+    Run our test suite using Python 3.10
 
-py38-debug
-    Same as ``py38``, but there are some useful debugging tools available in the environment.
+py310-debug
+    Same as ``py310``, but there are some useful debugging tools available in the environment.
 
 lint
     Run code linting using `Prospector`_. This currently runs `pylint`_,

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion=2.9.0
-envlist = py38,lint,docs
+envlist = py310,lint,docs
 skipsdist = True
 
 [testenv]