clean python dockerfile

sg-backend/Dockerfile

@@ -6,8 +6,6 @@ RUN pip install "poetry==$POETRY_VERSION"
 
 COPY poetry.lock pyproject.toml /code/
 
-#RUN pip3 install -r requirements.txt
-
 RUN poetry config virtualenvs.create false && poetry install --no-interaction --no-ansi
 COPY . /code