ci: set no cache using pip

Dockerfile

@@ -9,7 +9,7 @@ ENV PYTHONDONTWRITEBYTECODE=1
 ENV PYTHONUNBUFFERED=1
 ENV POETRY_CACHE_DIR=/opt/.cache
 
-RUN pip install "poetry==${POETRY_VERSION}"
+RUN pip install --no-cache-dir "poetry==${POETRY_VERSION}"
 
 WORKDIR /app