Config file read twice if $CWD is same as config dir, e.g. $HOME

[kzantow]

If a user runs from the $HOME directory (or any of the configuration directories), where a config file exists, the $CWD/<config> is found, in addition to the <config-file-location>/<config>. E.g. $HOME/.syft.yaml exists, and syft is run from $HOME, the same file is read twice.

See: anchore/syft#4322