title: Make variable visible across steps in Bitbucket pipelines?
body: <p>I would like to share a variable across two steps.</p>
  
  <p>I define it like:</p>
  
  <pre><code>- export MY_VAR="FOO-$BITBUCKET_BUILD_NUMBER"
  </code></pre>
  
  <p>but then when I try to print it in other step:</p>
  
  <pre><code>- echo $MY_VAR
  </code></pre>
  
  <p>it's empty.</p>
  
  <p>How I can share such variable?</p>