docs: public void setIgnoredEnvVars (final Set <String> aCollection)
    {
      ignoredEnvVars = new HashSet <> ();
      if (aCollection != null)
      {
        for (final String sName : aCollection)
          if (StringHelper.hasText (sName))
            if (!ignoredEnvVars.add (sName))
              getLog ().warn ("The ignored environment variable '" + sName + "' is contained more than once");
      }
    }