/var/run is deprecated in Ubuntu 20.04

[aranhoide]

The focal fossa version of this package has the following lines in the redis-server.service file:

PIDFile=/var/run/redis/redis-server.pid
[...]
ReadWriteDirectories=-/var/run/redis

The use of /var/run is deprecated in Ubuntu 20.04, and something in systemd aggressively changes that to /run in the PIDFile section with a warning, but fails to update the ReadWriteDirectories entry, ~~so it runs into permission issues trying to create the PID file~~ (P.S.: I was referring to the Operation not permitted error mentioned below, but this happens even after fixing this, so it may be unrelated). I have checked that changing both occurrences of /var/run to just /run removes the warning (P.S.: I still get a systemd[1]: redis-server.service: Can't open PID file /run/redis/redis-server.pid (yet?) after start: Operation not permitted warning at the beginning, but the server runs fine apparently so this may be a transient problem?).