deb: use symlink to install systemd-sysusers

Using [dh_installsysusers(1)]:

> FILES
>
> debian/package.sysusers
> If the file exists, it will be installed as /usr/lib/sysusers.d/package.conf.

[dh_installsysusers(1)]: https://manpages.debian.org/bookworm/debhelper/dh_installsysusers.1.en.html

Signed-off-by: Sebastiaan van Stijn <[email protected]>

Author: thaJeztah

deb/common/docker-ce.docker.sysusers

@@ -0,0 +1 @@
+../engine/contrib/systemd-sysusers/docker.conf

deb/common/rules

@@ -133,9 +133,6 @@ override_dh_auto_install:
 	install -D -p -m 0755 engine/contrib/dockerd-rootless-setuptool.sh debian/docker-ce-rootless-extras/usr/bin/dockerd-rootless-setuptool.sh
 	# TODO: how can we install vpnkit?
 
-	# install systemd sysusers config
-	install -D -p -m 0644 engine/contrib/systemd-sysusers/docker.conf debian/docker-ce/usr/lib/sysusers.d/docker.conf
-
 override_dh_installinit:
 	# use "docker" as our service name, not "docker-ce"
 	dh_installinit --name=docker