Steps to replicate the issue (include links if applicable):

• Windows 10
• Open powershell. Navigate to where you want to install mediawiki
• git clone
• Follow the steps at https://github.com/wikimedia/mediawiki/blob/master/DEVELOPERS.md
• Then type some docker compose exec mediawiki commands into powershell

What happens?:

time="2023-07-06T17:57:19-07:00" level=warning msg="The \"MW_DOCKER_UID\" variable is not set. Defaulting to a blank string."
time="2023-07-06T17:57:19-07:00" level=warning msg="The \"MW_DOCKER_GID\" variable is not set. Defaulting to a blank string."
time="2023-07-06T17:57:19-07:00" level=warning msg="The \"MW_DOCKER_UID\" variable is not set. Defaulting to a blank string."
time="2023-07-06T17:57:19-07:00" level=warning msg="The \"MW_DOCKER_GID\" variable is not set. Defaulting to a blank string."
time="2023-07-06T17:57:19-07:00" level=warning msg="The \"MW_DOCKER_UID\" variable is not set. Defaulting to a blank string."
time="2023-07-06T17:57:19-07:00" level=warning msg="The \"MW_DOCKER_GID\" variable is not set. Defaulting to a blank string."

What should have happened instead?:

• no warning messages about MW_DOCKER_UID and MW_DOCKER_GID

Software version (skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):

• May be intentional. Is generating noise/logspam on every docker compose exec mediawiki though.
• Possible fixes
  • Reduce to 2 warnings instead of 6?
  • Suppress this warning for non-Linux?
  • Suppress this warning for everyone by default, and use a debug var to turn it back on?
  • Get rid of this warning completely?
  • Add to DEVELOPING.md that Windows/Mac users should set these variables to blank in their .env file <--- I think I prefer this approach.