alpine linux logrotate docker build

this container is built to be used as a sidecar container for handling log rotations as part of the samsung_cnct central logging project. this container will be used by the per-node log aggregator to handle node-level log rotatations.

the script load-and-sleep.sh will load logrotate's execution script into the 15 minute periodic run folder. the execution script is /run-logrotate and contains a call to execute logrotate with the below config file.

the config file is landed at /logrotate.conf. If you wish to override it, land a new config to the same spot. the config assumes all log files are being landed at /var/log/containers/* where the final wildcard is the pod unique identifier. logrotate does not have a recursive option, so currently this will go two levels deep looking for logs