gitlab-ci-lint hook no longer working since GitLab CI lint API requires authentication

Since GitLab v13.12.2 release, this security fix has been introduced:

• Unauthenticated CI lint API may lead to information disclosure and SSRF

Now the CI lint API requires authentication. This is not yet documented into the lint API

Issue on gitlab-ci-lint repository

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To circumvent this issue, I see three solution now.

• We could set-up a token access to read and write on the API via an option or via an environment variable:
  • We could store this token into .pre-commit-config.yml: anyone could access in read/write DuniterPy API
  • Use an environment variable that we would share among trusts contributors. Tested, it's working. Would prevent new contributor to do new commits with this check which would fail.
• Delete this hook. We would loose this useful check.

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There might be a solution in between. We could disable this check in the meantime to find a middle solution to this issue.

@vtexier, any opinion on that?