title: gitlab ci with conda not using the latest package version
body: <p>I am using a docker image from by Continuum Analytics in my <code>.gitlab-ci.yml</code> file, in order to use conda (as well explained <a href="https://beenje.github.io/blog/posts/gitlab-ci-and-conda/" rel="nofollow noreferrer">here</a>)</p>
  
  <p>Everything works fine except for one detail: I cannot get the latest version of a package published on a specific channel (<a href="https://anaconda.org/PascalLesage/presamples" rel="nofollow noreferrer">this one</a>, but that shouldn't matter) - the latest version is 0.2.6, but the version 0.2.3 is installed. </p>
  
  <p>If I specify in my <code>environment.yaml</code> file that I want a specific version: </p>
  
  <pre><code>dependencies:
   - presamples&gt;=0.2.6
  </code></pre>
  
  <p>I get the following error during build: </p>
  
  <pre><code>ResolvePackageNotFound: 
     - presamples[version='&gt;=0.2.6']
  </code></pre>
  
  <p>Are Continuum Analytics docker image not able to download versions of packages that were created after the docker image was created? This may be a silly question, I don't know anything about docker...</p>