Trying to add custom logo

Using docker, Vikunja version 0.22.1.
Trying to add a custom logo, but not able to find any information in the documentation. Only in the gitea repo. It seems like I can add custom URL with env, but doesn’t seem to work.
Added the env under frontend docker:

If you view the source of the deployed frontend, does it contain the window.CUSTOM_LOGO_URL with the correct value?

Make sure to clear all browser cache.