<h3>Contribution description</h3>
<p>Currently, some tests are run by CI on real hardware, if the label "CI: run tests" is set.<br>
This PR reverses the logic, so the tests are run unless "CI: skip tests" is set.</p>
<p>Test caching reduces the build time overhead to less than a minute for most PRs. For more intrusive changes, it is more, but also more likely to find bugs.</p>

<h3>Testing procedure</h3>

<h3>Issues/PRs references</h3>


<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/RIOT-OS/RIOT/pull/11782'>https://github.com/RIOT-OS/RIOT/pull/11782</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>ci: always run on-hardware tests</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/11782/files#diff-0">.murdock</a>
    (4)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/11782.patch'>https://github.com/RIOT-OS/RIOT/pull/11782.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/11782.diff'>https://github.com/RIOT-OS/RIOT/pull/11782.diff</a></li>
</ul>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br />You are receiving this because you are subscribed to this thread.<br />Reply to this email directly, <a href="https://github.com/RIOT-OS/RIOT/pull/11782?email_source=notifications&email_token=ABE7WYGZDYKSEWP3VCYMJV3P5STBPA5CNFSM4H5F4DCKYY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4G5ELKFQ">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe-auth/ABE7WYAEPRKF2JVRPRJDG4LP5STBPANCNFSM4H5F4DCA">mute the thread</a>.<img src="https://github.com/notifications/beacon/ABE7WYAUWECYFDGK4FL6KSLP5STBPA5CNFSM4H5F4DCKYY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4G5ELKFQ.gif" height="1" width="1" alt="" /></p>
<script type="application/ld+json">[
{
"@context": "http://schema.org",
"@type": "EmailMessage",
"potentialAction": {
"@type": "ViewAction",
"target": "https://github.com/RIOT-OS/RIOT/pull/11782?email_source=notifications\u0026email_token=ABE7WYGZDYKSEWP3VCYMJV3P5STBPA5CNFSM4H5F4DCKYY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4G5ELKFQ",
"url": "https://github.com/RIOT-OS/RIOT/pull/11782?email_source=notifications\u0026email_token=ABE7WYGZDYKSEWP3VCYMJV3P5STBPA5CNFSM4H5F4DCKYY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4G5ELKFQ",
"name": "View Pull Request"
},
"description": "View this Pull Request on GitHub",
"publisher": {
"@type": "Organization",
"name": "GitHub",
"url": "https://github.com"
}
}
]</script>