title: How to get AWS account id as custom variable in serverless framework?
body: <p>In serverless framework, I want to set the deployment bucket as </p>
  
  <pre><code>&lt;project_name&gt;-&lt;stage&gt;-&lt;account_id&gt;
  </code></pre>
  
  <p>I can get the stage using a custom variable, like:</p>
  
  <pre><code>custom:
      stage: ${opt:stage, self:provider.stage}
  </code></pre>
  
  <p>but how can I get the aws account id? I already tried to used <em>serverless-pseudo-parameters</em>, like this below, without success.</p>
  
  <pre><code>custom:
      account_id: #{AWS::AccountId}
  plugins:
    - serverless-pseudo-parameters
  </code></pre>
  
  <p>Someone could help me to set the account id as a custom variable?</p>