title: Pytest: Only run linter checks (pytest-flake8), don't run tests
body: <p>I'm using the <a href="https://pypi.org/project/pytest-flake8/" rel="noreferrer">pytest-flake8</a> plugin to lint my Python code.
  Everytime I run the linting like this:</p>
  
  <pre><code>pytest --flake8
  </code></pre>
  
  <p>In addition to the linting, all tests are run. 
  But I would like to run the linter checks only.</p>
  
  <p>How can I configure pytest so it only lints the code but skips all my tests, preferrably via commandline (or conftest.py) - <strong>without having to add skip markers to my tests</strong>?</p>