Pass in the access key and secret key for minio

added to epic &18 (closed)

Pass in the access key and secret key for minio via secret in top level umbrella. For example:

minio:
  instance:
    accesskey: userprovided
    secretkey: userprovided

Randomly generate them if none pass in, or better understand how we provide an unencrypted one

added minio label

/dupliate #104 (closed)

closed

assigned to @LynnStill