add catleg (linting) job
To actually run diffs, this requires the variables CATLEG_LF_CLIENT_ID
and CATLEG_LF_CLIENT_SECRET
to be defined with Legifrance credentials in the gitlab CI configuration
To actually run diffs, this requires the variables CATLEG_LF_CLIENT_ID
and CATLEG_LF_CLIENT_SECRET
to be defined with Legifrance credentials in the gitlab CI configuration