[ci/Dockerfile] use of alpine OS instead of debian, bump python to version 3.11

.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:3.9-bullseye
+image: python:3.11.4-alpine3.18
 
 # Change pip's cache directory to be inside the project directory since we can
 # only cache local items.
@@ -33,7 +33,7 @@ stages:
 
 .before_script_template: &test
   before_script:
-    - apt-get update && apt-get -y install python3-venv
+    - apk update && apk add py3-virtualenv py3-pip
     - python3 -V  # Print out python version for debugging
     - pip3 install pipenv
     - pipenv install  --dev --skip-lock
@@ -60,7 +60,7 @@ test:
 build_pypi:
   stage: build
   script:
-    - apt-get update && apt-get -y install python3-venv
+    - apk update && apk add py3-virtualenv py3-pip
     - python3 -V  # Print out python version for debugging
     - pip3 install pipenv
     - pipenv install  --dev --skip-lock

Dockerfile

@@ -1,8 +1,8 @@
 # syntax=docker/dockerfile:1
-FROM docker.io/python:3.10.5-slim-bullseye
+FROM python:3.11.4-alpine3.18
 COPY . /halfapi
 WORKDIR /halfapi
-RUN apt-get update > /dev/null && apt-get -y install git > /dev/null
+RUN apk update > /dev/null && apk add git > /dev/null
 RUN pip install gunicorn uvicorn
 RUN pip install .
 CMD gunicorn halfapi.app