debian packages install /etc/mysql/mariadb.cnf however its not read by default

$ mysqld --help --verbose

Default options are read from the following files in the given order:

/etc/my.cnf /etc/mysql/my.cnf ~/.my.cnf 

~$ dpkg-deb  --extract mariadb-common_10.3.6+maria~artful_all.deb /tmp/mc

$ find /tmp/mc

/tmp/mc

/tmp/mc/usr

/tmp/mc/usr/share

/tmp/mc/usr/share/doc

/tmp/mc/usr/share/doc/mariadb-common

/tmp/mc/usr/share/doc/mariadb-common/copyright

/tmp/mc/usr/share/doc/mariadb-common/changelog.gz

/tmp/mc/etc

/tmp/mc/etc/mysql

/tmp/mc/etc/mysql/mariadb.cnf

/tmp/mc/etc/mysql/mariadb.conf.d

 find /etc/mysql/mariadb.conf.d/ -ls

  1310736      4 drwxr-xr-x   2 root     root         4096 Mar 21 21:00 /etc/mysql/mariadb.conf.d/

  1312766      4 -rw-r--r--   1 root     root           53 Mar 21 20:41 /etc/mysql/mariadb.conf.d/cracklib_password_check.cnf

  1312769      4 -rw-r--r--   1 root     root           40 Mar 21 20:41 /etc/mysql/mariadb.conf.d/rocksdb.cnf

  1312765      4 -rw-r--r--   1 root     root           40 Mar 21 20:41 /etc/mysql/mariadb.conf.d/connect.cnf

  1312768      4 -rw-r--r--   1 root     root           40 Mar 21 20:41 /etc/mysql/mariadb.conf.d/oqgraph.cnf

  1312763      4 -rw-r--r--   1 root     root           48 Mar 21 20:41 /etc/mysql/mariadb.conf.d/aws_key_management.cnf

  1312754      4 -rw-r--r--   1 root     root          647 Mar 21 20:02 /etc/mysql/mariadb.conf.d/config.cnf

  1312764      4 -rw-r--r--   1 root     root          767 Mar 21 19:07 /etc/mysql/mariadb.conf.d/enable_encryption.preset

  1312767      4 -rw-r--r--   1 root     root           41 Mar 21 20:41 /etc/mysql/mariadb.conf.d/auth_gssapi.cnf

!include /etc/mysql/mariadb.cnf