Support for skipping gitlab repositories when scanning

[rndmh3ro]

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Description

We want to scan our whole gitlab instance for secrets and report the findings to the owners of the repository. However we want to provide the users a way to opt out of scanning their repositories. So we'd like to have an option to skip repos by url.

Problem to be Addressed

I'd like to scan all our repositories but don't want to spam users who don't want to get their repos scanned.

Description of the Preferred Solution

An option to skip repos, e.g.:

trufflehog gitlab --token $TOKEN --endpoint=https://example.com --skip-repo https://example.com/path/to/skip/repo.git

[zricethezav]

Seeing as how we can skip GitHub repos, skipping GitLab repos should be an option too. I'll look into adding this feature.