SubPath mounts into plugin directories were causing k8s to create those
directories owned by root before the server process could write to them.
LuckPerms was failing with "Unable to create libs directory" as a result.
Move config injection to the initContainer: it now cleans stale JARs
(rm *.jar), copies fresh JARs from the plugins image, and pre-creates
the LuckPerms and PurpurExtras directories with configs copied from
ConfigMaps. Main container no longer mounts configs via subPath.
Also fixes stale JAR accumulation — initContainer now clears old JARs
before copying, preventing broken old versions from loading.
Will Anderson
e482059a03