Better way to handling the minIO credentials

[hauck-jvsh]

When a case is processed using minIO as the storage service the credential used is not saved. So when the user opens the case he must pass the credentials as an environment variable. This behavior may not work when opening a multi case with data storage in more than one minIO server. I think that a better option is to ask for the password as soon as it is needed, for example when the user tries to open a file. Another thing to be alert is that may be necessary to maintain a map of minio serves with its credentials in memory.

[lfcnassif]

We can also save credentials in user local temp to reuse them later