title: How to ignore files when running `gcloud app deploy`?
body: <p>When I run</p>
  
  <pre><code>gcloud app deploy app.yaml
  </code></pre>
  
  <p>which files actually get uploaded?</p>
  
  <p>The project folder contains folders and files such as <code>.git</code>, <code>.git_ignore</code>, <code>Makefile</code> or <code>venv</code> that are irrelevant for the deployed application.</p>
  
  <p>How does <code>gcloud app deploy</code> decide which files get uploaded?</p>