nginx. conf存在，但是由于某种原因docker看不到它，如何解决它？

FROM nginx
USER root
WORKDIR /D05/
COPY ./nginx/nginx.conf /etc/nginx/
COPY ./server.c /home/server.c
COPY ./start.sh /home/start.sh
RUN apt-get update && apt install -y gcc libfcgi-dev spawn-fcgi;
ENTRYPOINT [ "sh", "./start.sh" ]

Step 4/8 : COPY ./nginx/nginx.conf /etc/nginx/
COPY failed: file not found in build context or excluded by

.停靠忽略：统计nginx/nginx配置文件：文件不存在

什么可能导致这个问题？对不起，我的英语