Merge branch 'fix/dockerfileInstallPoetry' into 'main'

fix(Dockerfile): Use new correct way to install poetry

See merge request !5

Dockerfile

 FROM python:3.8
 
-RUN curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/install-poetry.py | python -
+RUN pip install --no-cache-dir poetry==1.8.3
 
 RUN mkdir --parents /app/
 WORKDIR /app
 
 COPY pyproject.toml poetry.lock README.md /app/
-RUN /root/.local/bin/poetry install --no-dev
+RUN poetry install --no-dev
 
 COPY stuvus_bot /app/stuvus_bot
 
 EXPOSE 8080
 ENV PYTHONUNBUFFERED=1
 
-CMD /root/.local/bin/poetry run stuvus-bot
+CMD poetry run stuvus-bot