lock poetry version, remove poetry cache, use venv

Dockerfile

@@ -2,12 +2,16 @@ FROM python:3.10-slim
 
 WORKDIR /app
 
-RUN pip install poetry
+RUN pip install poetry==1.6.1
+
+ENV POETRY_NO_INTERACTION=1 \
+    POETRY_VIRTUALENVS_IN_PROJECT=1 \
+    POETRY_VIRTUALENVS_CREATE=1 \
+    POETRY_CACHE_DIR=/tmp/poetry_cache
 
 COPY pyproject.toml poetry.lock ./
 
-RUN poetry config virtualenvs.create false && \
-    poetry install --no-dev
+RUN poetry install --without dev && rm -rf $POETRY_CACHE_DIR
 
 RUN apt update && apt install libmagic1 -y
 RUN poetry add python-magic