Docker (julia:1.7.0-alpine3.15) with custom Python Enviroment

Tooling
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Hey there, I am trying to create a Docker-Template for anyone who wants to run their projects in Docker/Apline with a custom Python Version.

Currently, I´m getting this issue and I don’t know how to fix it. There are plenty of people out there saying “unset” Pythonhome ENV but this wasn’t working for me too.

Python path configuration:
  PYTHONHOME = '/root/.pyenv/versions/3.7.8:/root/.pyenv/versions/3.7.8'
  PYTHONPATH = (not set)
  program name = '/root/.pyenv/versions/3.7.8/bin/python'
  isolated = 0
  environment = 1
  user site = 1
  import site = 1
  sys._base_executable = '/root/.pyenv/versions/3.7.8/bin/python'
  sys.base_prefix = '/root/.pyenv/versions/3.7.8'
  sys.base_exec_prefix = '/root/.pyenv/versions/3.7.8'
  sys.platlibdir = 'lib'
  sys.executable = '/root/.pyenv/versions/3.7.8/bin/python'
  sys.prefix = '/root/.pyenv/versions/3.7.8'
  sys.exec_prefix = '/root/.pyenv/versions/3.7.8'
  sys.path = [
    '/root/.pyenv/versions/3.7.8/lib/python39.zip',
    '/root/.pyenv/versions/3.7.8/lib/python3.9',
    '/root/.pyenv/versions/3.7.8/lib/python3.9/lib-dynload',
  ]
Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding
Python runtime state: core initialized
ModuleNotFoundError: No module named 'encodings'

This is my Dockerfile

FROM julia:1.7.0-alpine3.15

WORKDIR /app
ADD / /app

RUN apk add linux-headers
# Update & Install dependencies
RUN apk add --no-cache --update \
    git \
    bash \
    libffi-dev \
    openssl-dev \
    bzip2-dev \
    zlib-dev \
    readline-dev \
    sqlite-dev \
    build-base

# Set Python version
ARG PYTHON_VERSION='3.7.8'
# Set pyenv home
ARG PYENV_HOME=/root/.pyenv

# Install pyenv, then install python versions
RUN git clone --depth 1 https://github.com/pyenv/pyenv.git $PYENV_HOME && \
    rm -rfv $PYENV_HOME/.git

ENV PATH $PYENV_HOME/shims:$PYENV_HOME/bin:$PATH

RUN pyenv install $PYTHON_VERSION
RUN pyenv global $PYTHON_VERSION
RUN pip install --upgrade pip && pyenv rehash

# Clean
RUN rm -rf ~/.cache/pip

# Installs Stuff for Alpine
RUN apk --update add libxml2-dev libxslt-dev libffi-dev gcc musl-dev libgcc openssl-dev curl
RUN apk add jpeg-dev zlib-dev freetype-dev lcms2-dev openjpeg-dev tiff-dev tk-dev tcl-dev
RUN apk add python3-dev

# Installs your Python stuff
RUN pip install -r requirements.txt

RUN julia -e 'ENV["PYCALL_JL_RUNTIME_PYTHONHOME"]="/root/.pyenv/versions/3.7.8/bin/python"'
RUN julia -e 'ENV["PYTHON"]="/root/.pyenv/versions/3.7.8/bin/python"; using Pkg; Pkg.add("PyCall"); Pkg.build("PyCall"); Pkg.instantiate(); Pkg.precompile()'


ENTRYPOINT [ "julia" ]
CMD [ "src/docker_runs_checker.jl"]

Here you find all project files https://github.com/MalteBoehm/julia_docker-compose_template

Thanks for the help.