title: Dockerfile COPY file fails
body: <p>I have a simple Dockerfile</p>
  
  <pre><code>FROM php:7.1-apache
  LABEL maintainer="rburton@agsource.com"
  COPY MyAgsourceAPI /var/www/MyAgsourceAPI
  COPY MyAgsourceAPI/conf/php/drivers /usr/lib/apache2/modules/
  COPY MyAgSourceAPI/conf/php/apache2/php.ini /usr/local/etc/php/
  </code></pre>
  
  <p>Using the build command:</p>
  
  <pre><code>docker build -t rkevinburton/myagsourceapi .
  </code></pre>
  
  <p>The last line returns the error:</p>
  
  <pre><code>Step 5/5 : COPY MyAgSourceAPI/conf/php/apache2/php.ini /usr/local/etc/php/
  COPY failed: stat /var/lib/docker/tmp/docker-builder231753667/MyAgSourceAPI/conf/php/apache2/php.ini: no such file or directory
  </code></pre>
  
  <p>All the other 'COPY' lines execute without error. I am not clear what this means or how my Dockerfile should change. I am taking this COPY mostly from the documentation on docker hub for php. This may be due to a read-only nature of /usr/local/etc/php. But I cannot tell from the error. Ideas?</p>