Use python:3.11-alpine base image instead of python:alpine

python:alpine currently points to python:3.12-alpine, which does
not include distutils, a dependency for otumat

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:alpine
+FROM python:3.11-alpine
 
 COPY ./nginx/entrypoint.py /entrypoint.py
 RUN \