Debian 8 only has mysql 5.6 available through backports. That has a systemd service unit, written in 2014 by Akhil Mohan of Oracle. That service unit invokes mysqld_safe, though, in classic systemd House of Horror fashion.
You're right, again, even though you linked arm64 file lists instead of amd64. The 5.6 backport does have that unit file, but the badly written one from Oracle. I guess you shouldn't use Debian (-:
Debian 8 packages up mysql 5.5 with only a van Smoorenburg rc script, no systemd units.
* https://packages.debian.org/en/jessie/arm64/mysql-server-5.5...
Debian 8 only has mysql 5.6 available through backports. That has a systemd service unit, written in 2014 by Akhil Mohan of Oracle. That service unit invokes mysqld_safe, though, in classic systemd House of Horror fashion.
* https://packages.debian.org/en/jessie-backports/arm64/mysql-...
* https://anonscm.debian.org/cgit/pkg-mysql/mysql-5.6.git/tree...
Apparently, Red Hat Enterprise Linux 7 has no systemd unit files for mysql 5.6, either, and still uses mysqld_safe.
* http://rpm.pbone.net/index.php3/stat/6/idpl/34647467/dir/red...