salsa-ci.yml: Allow daemons to start during autopkgtest
The "official" docker image has a policy-rc.d
which always exits 101, preventing invoke-rc.d to start services.
Only removing /usr/sbin/policy-rc.d prints: invoke-rc.d: could not determine current runlevel invoke-rc.d: WARNING: No init system and policy-rc.d missing! Defaulting to block.
So a symlink to /bin/true (exit 0) is needed.