title: Dockerfile can not find entrypoint script
body: <p>I want to use a bash script as the entrypoint in the dockerfile. The code as blow:</p>
  
  <pre><code>ENV INST  INIT
  ADD start.sh /start.sh
  RUN chmod 777 /start.sh
  ENTRYPOINT /start.sh $INST
  </code></pre>
  
  <p>It should be right. But when I build the image and run it, the result as below:</p>
  
  <pre><code>/bin/sh: 1: /start.sh: not found
  </code></pre>
  
  <p>Could anyone help me? Thanks.
  Total Dockerfile:</p>
  
  <pre><code>FROM debian:latest
  
  ENV INST  INIT
  RUN apt-get update
  RUN apt-get install -y git build-essential gcc g++ vim 
  
  
  RUN mkdir /Lab-C-Framework
  WORKDIR /Lab-C-Framework
  ADD Lab-C-Framework /Lab-C-Framework
  RUN make install
  RUN chmod 777 -R /Lab-C-Framework
  
  RUN mkdir /project
  ADD bin /project
  ADD src /project
  ADD header /project
  ADD tests /project
  ADD Docs /project
  ADD Makefile /project
  RUN chmod 777 -R /project
  
  ADD start.sh /start.sh
  RUN chmod 777 /start.sh
  
  RUN mkdir /code
  RUN chmod 777 /code
  VOLUME /code 
  WORKDIR /code
  
  
  ENTRYPOINT /start.sh $INST
  </code></pre>