Use temporary files to save dumps

[Akarys42]

Rationale

Currently dumps are saved under the home folder. If Blackbox unexpectedly exit during archiving, the file will be left there and not deleted. This can cause issues for both security and disk space.

Specification

tempfile.NamedTempFile can be used to pass a temporary file handle directly to the database handler and retrieved by the main function. This will also allow us to have uniform file names in a DRY fashion.

Note: I’d be interested in implementing that