Debug postUpgradeTask for Inspec

Refer to https://github.com/micheelengronne/renovatebot-debug-postupgradetask/issues/2

config.js used:

module.exports = {
 endpoint: 'https://gitlab.com/api/v4/',
 trustLevel: 'high',
 logLevel: 'debug',
 allowedPostUpgradeCommands: ['^ruby-coppint-inspec vendor --overwrite ./$'],
 token: 'GITLABTOKEN',
 platform: 'gitlab',
 assignees: ['micheelengronne'],
 baseBranches: ['master'],
 gitAuthor: 'Michée Lengronne <michee.lengronne@coppint.com>',
 autodiscover: true,
 binarySource: 'global',
 rebaseWhen: 'behind-base-branch'
};

Following MR: !1 (closed)