Support placing plugins on the server

[allandegnan]

My understanding is vault needs custom plugins to exist on the filesystem at some path but I can't see an obvious way of achieving this via the current chart.

Two methods I've seen are:

1. Stuff binaries in a configMap.
2. Support emptyDir for extraVolumes.

I've written a PR for option 2.

[jasonodonnell]

@allandegnan Binaries definitely shouldn't go into configMaps. I'm curious how you will populate the emptyDir with the binary? Using an init container to fetch it?

[allandegnan]

@jasonodonnell - Yep, pretty much. cp from the initContainer.

Save us from having to build & track your (hashi) containers.

[jasonodonnell]

#314 makes this possible now. Closing.

[timclifford]

Is there not a better/new way to load custom plugins into vault other than the above? I'm using the second approach but was wondering if custom plugins were better supported now