[Ruby 2.7] [Redmine 4.2.x] [additional_tags 1.0.4] fatal: not a git repository when starting Puma or doing plugin migration

[danowar2k]

I installed additionals 3.0.5.2 and now additional_tags 1.0.4 on my Redmine 4.2.8 .

When I did plugin migrations and now every time I start the webserver, the logs contain this:

Feb 01 20:27:55 dev-redmine systemd[1]: Starting Redmine Issue Tracker on Puma...
Feb 01 20:27:55 dev-redmine bundle[2694630]: fatal: not a git repository (or any parent up to mount point /)
Feb 01 20:27:55 dev-redmine bundle[2694630]: Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
Feb 01 20:27:55 dev-redmine bundle[2694630]: [2694630] Puma starting in cluster mode...

• My RHEL 8 server does have git installed (or else the message would be different)
• I didn't clone the repositories but installed the plugins by downloading the code https://api.github.com/repos/AlphaNodes/additional_tags/tarball/1.0.4

Is this because of the gemspec line here?
https://github.com/AlphaNodes/additional_tags/blob/main/additional_tags.gemspec#L19