Add s3 env vars

Author: vshepard

testgres/plugins/pg_probackup2/pg_probackup2/init_helpers.py

@@ -201,6 +201,10 @@ def __init__(self):
         os.environ["PGAPPNAME"] = "pg_probackup"
         self.delete_logs = delete_logs
 
+        # s3 params
+        self.s3_config_file = test_env.get('PG_PROBACKUP_S3_CONFIG_FILE')
+        self.s3_type = test_env.get('PG_PROBACKUP_S3_TEST')
+
     def test_env(self):
         return self._test_env.copy()