compress core files before saving them

Author: grooverdan

configuration/steps/commands/mtr.py

@@ -73,6 +73,7 @@ def _save_logs(self) -> str:
             echo "Saving MTR logs to persistent volume because some tests failed"
             cd {self.log_path}
             mkdir -p {self.save_logs_path}
+            time find . -iregex ".*/core\(\.[0-9]+\)" -ls  -exec gzip {} \;
             find . -type f \( {patterns} \) -print0 | rsync -a --files-from=- --from0 ./ {self.save_logs_path}/
             exit 1
             """