Dubious repository ownership when building GitHub Pages

GitHub page building started to give the following error:

Run scripts/build
fatal: detected dubious ownership in repository at '/__w/onion-launchpad/onion-launchpad'
To add an exception for this directory, call:

	git config --global --add safe.directory /__w/onion-launchpad/onion-launchpad
Error: Process completed with exit code 1.