name.tmpfile I think (so gitaly-installer.tmpfile)
I can see the package has correctly installed tmpfiles configuration
/usr/lib/tmpfiles.d/gitaly-installer.confBut this hard codes username, so will break if users select a username during installation (usually people prefer git as username instead of gitlab).
So we need to read the username value from debconf database and use that. See gitlab package for how to do it. Read the debconf manual too.
Please test it with a different username selected during gitlab-common installation and see if the tmpfiles configuration reflects the selected username.
OpenPGP_0x8F53E0193B294B75.asc
Description: OpenPGP public key
OpenPGP_signature.asc
Description: OpenPGP digital signature