[feature request] Please introduce a default location for debcvescan.whitelist and/or a --config-dir[ectory] option

[m-ueberall]

The new whitelisting feature introduced in v0.1.19/0.1.20 currently expects a list of whitelisted entries to reside in the current working directory:

debcvescan/pkg/analyzer/whitelist.go

Line 37 in 4deff2d

file, err := os.Open("./debcvescan.whitelist")

It would be helpful if another location of said whitelist could be specified by the user using a --config-dir[ectory] option, e.g. defaulting to ~/.debcvescan/ or ~/.config/debcvescan/. (In case a ./debcvescan.whitelist file exists, this could/should take precedence for backwards compatibility.)