I'm following instructions on [[ https://www.mediawiki.org/wiki/Selenium/How-to/Record_videos_of_test_runs | Selenium/How-to/Record videos of test runs ]] page, but I'm getting `_XSERVTransmkdir: ERROR: euid != 0,directory /tmp/.X11-unix will not be created.`
```
~/Documents/gerrit/mediawiki/core$ fresh-node -env -net
# fresh: 21.04.1 (2021-04-29)
# image: docker-registry.wikimedia.org/releng/node10-test-browser:0.6.3-s2
# software: Debian GNU/Linux 9 (stretch)
# Node.js v10.15.2 (npm 6.14.5)
# Chromium 73.0.3683.75
# Mozilla Firefox 68.12.0esr
# JSDuck 5.3.4 (Ruby 2.3.3)
# mount: /core ➟ /Users/z/Documents/gerrit/mediawiki/core (read-write)
# /core/.git ➟ /Users/z/Documents/gerrit/mediawiki/core/.git (read-only)
# env: MW_*, MEDIAWIKI_*
# net: expose host
🌱 Fresh!
nobody@docker-desktop:/core$ export DISPLAY=:1
nobody@docker-desktop:/core$ Xvfb "$DISPLAY" -screen 0 1280x1024x24 &
[1] 8
_XSERVTransmkdir: ERROR: euid != 0,directory /tmp/.X11-unix will not be created.
```