Merge branch 'transform-template' into 'main'

Limit python version to 3.12

See merge request bassa/lofty!3

.gitlab-ci.yml

 default:
-  image: $CI_REGISTRY_IMAGE/ci-build-runner:$CI_COMMIT_REF_SLUG
+  image:
+    name: $CI_REGISTRY_IMAGE/ci-build-runner:$CI_COMMIT_REF_SLUG
+    pull_policy: "always"
   before_script:
     - python --version # For debugging
   cache:

docker/ci-runner/Dockerfile

-FROM python:3.13
+FROM python:3.12
 
 RUN python -m pip install --upgrade pip
 RUN pip install --upgrade tox twine

tox.ini

 [tox]
 # Generative environment list to test all supported Python versions
-envlist = py3{9,10,11,12,13},black,pep8,pylint
+envlist = py3{9,10,11,12},black,pep8,pylint
 min_version = 4.3.3
 requires =
     tox-ignore-env-name-mismatch >= 0.2.0