[ci] use alpine base image directly

.gitlab-ci.yml

@@ -6,7 +6,7 @@
 
 # Official language image. Look for the different tagged releases at:
 # https://hub.docker.com/r/library/python/tags/
-image: python:3.11.4-alpine3.17
+image: alpine:3.18
 
 # Change pip's cache directory to be inside the project directory since we can
 # only cache local items.
@@ -33,18 +33,18 @@ stages:
 
 .before_script_template: &test
   before_script:
-    - apk update && apk add py3-virtualenv py3-pip py3-exceptiongroup
+    - apk update && apk add python3 py3-virtualenv py3-pip
     - python3 -V  # Print out python version for debugging
     - pip3 install pipenv
     - pipenv install  --dev
 
 test:
-  image: python:${PYVERSION}-alpine3.17
+  image: alpine:${ALPINEVERSION}
   stage: test
   <<: *test
   parallel:
     matrix:
-      - PYVERSION: ["3.8", "3.9", "3.10", "3.11"]
+      - ALPINEVERSION: ["3.13","3.14","3.15","3.16","3.17","3.18"]
   script:
     - pipenv run pytest --version
     - PYTHONPATH=./tests/ pipenv run coverage run --source halfapi -m pytest