Use correct Docker image per Pyhon version

.gitlab-ci.yml

@@ -1,5 +1,3 @@
-image: python:latest
-
 # Change pip's cache directory to be inside the project directory since we can
 # only cache local items.
 variables:
@@ -15,6 +13,10 @@ cache:
     - .cache/pip
     - venv/
 
+stages:
+  - lint
+  - test
+
 before_script:
   - python -V
   - pip install virtualenv
@@ -22,11 +24,35 @@ before_script:
   - source venv/bin/activate
 
 lint:
+  stage: lint
   script:
     - pip3 install black
     - black --check src/
 
-test:
+python-37:
+  stage: test
+  image: python:3.7
   script:
     - pip3 install tox
-    - tox
+    - tox -e py37
+
+python-38:
+  stage: test
+  image: python:3.8
+  script:
+    - pip3 install tox
+    - tox -e py38
+
+python-39:
+  stage: test
+  image: python:3.9
+  script:
+    - pip3 install tox
+    - tox -e py39
+
+python-310:
+  stage: test
+  image: python:3.10
+  script:
+    - pip3 install tox
+    - tox -e py310

setup.cfg

@@ -28,7 +28,7 @@ console_scripts =
     gbasm = gbasm.gbasm:main
 
 [tox:tox]
-envlist = py3{7,8,9}
+envlist = py3{7,8,9,10}
 
 [testenv]
 deps = pytest