강사님 settings.py 에 allowed_host에 ['*']을 해줬는데도 허가되지 않다고 에러가 나네요.

안녕하세요 image 생성중에 자꾸 Step 1/9 : FROM python:3.9.0 ---> 0affb4652fc0 Step 2/9 : WORKDIR /home/ ---> Using cache ---> cf3d9128955d Step 3/9 : RUN git clone https://github.com/sunghyunpk/-Django_web.git ---> Using cache ---> 25404b05ac91 Step 4/9 : WORKDIR /home/pragmatic/ ---> Using cache ---> efdf66830cc7 Step 5/9 : RUN pip install -r requirements.txt ---> Running in 288e5d7c2dbc ERROR: Could not open requirements file: [Errno 2] No such file or directory: 'requirements.txt' WARNING: You are using pip version 20.3.1; however, version 21.0.1 is available. You should consider upgrading via the '/usr/local/bin/python -m pip install --upgrade pip' command. The command '/bin/sh -c pip install -r requirements.txt' returned a non-zero code: 1 이러한 에러가 발생하는데 requirements.txt 파일이 존재 하는데 이러한 에러가 발생하는 이유가 혹시 있을까요 ?