[rsyslogd] [logrotate] proper way to reload `rsyslog` after doing logrotation

[pjacak]

In logrotate examples of how to handle rsyslog's logs it's suggested to have lines like that et the end of config:

  postrotate
    reload rsyslog >/dev/null 2>&1 || true
  endscript

In this image there is no openRC, no services instead rsyslogd is just started in entrypoint.sh. So this command fails:

/ # reload rsyslog
sh: reload: not found

and as a result after logs rotation new file is not written.

Solution I've found working was to use this in logrotate config

  postrotate
    pkill -HUP rsyslogd || true
  endscript

to reload rsyslogd.

It's not exactly problem with this image, but I think a note about it in README.md might help others.