Add gloval cov file to build config

Author: andreicuceu

vega/build_config.py

@@ -392,6 +392,7 @@ def _build_main_config(self, fit_type, fit_info, parameters, git_hash):
         config['data sets']['zeff'] = str(self.zeff_in)
         corr_paths = [str(path) for path in self.corr_paths]
         config['data sets']['ini files'] = ' '.join(corr_paths)
+        config['data sets']['global-cov-file'] = fit_info.get('global_cov_file', 'None')
 
         # Write the scale parameters functions
         config['cosmo-fit type'] = {}