/root/.bashrc not accessible by kohadev-koha

On (at least) U18 and D11:

root@c4adf9b9b785:koha(master|BISECTING)$ kshell
bash: /root/.bashrc: Permission denied

See also

Bug 25538 - www/search_utf8.t is failing randomly

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=25538