Why is postgres container ignoring /docker-entrypoint-initdb.d/* in Gitlab CI

This has been easier than I expected, and fatally nothing to do with Gitlab CI but with file permissions.

I passed --chmod=Du+rwx,Dgo-rwx,u+rw,go-rw to rsync which looked really secure because only the user can do stuff. I confess that I propably copypasted it from somewhere on the internet. But then the files are mounted to the Docker container, and in there they have those permissions as well:

-rw------- 1 1005 1004 314 May  8 15:48 100-create-database.sql

On the host my gitlab-ci user owns those files, they are obviously also owned by some user with ID 1005 in the container as well, and no permissions are given to other users than this one.

Inside the container the user who does things is postgres though, but it can't read those files. Instead of complaining about that, it just ignores them. That might be something to create an issue about…

Now that I pass --chmod=D755,F644 it looks like that:

-rw-r--r--  1 1005 1004  314 May  8 15:48 100-create-database.sql

and the docker logs say

/usr/local/bin/docker-entrypoint.sh: running /docker-entrypoint-initdb.d/100-create-database.sql

Too easy to think of in the first place :-/