Copper6ssp Bid Adapter: add gvl_id (prebid#12498)

* release adapter Copper6SSP

* removed code duplication

* add gvl_id

Author: Copper6SSP

modules/copper6sspBidAdapter.js

@@ -5,9 +5,11 @@ import { isBidRequestValid, buildRequests, interpretResponse, getUserSyncs } fro
 const BIDDER_CODE = 'copper6ssp';
 const AD_URL = 'https://endpoint.copper6.com/pbjs';
 const SYNC_URL = 'https://сsync.copper6.com';
+const GVLID = 1356;
 
 export const spec = {
   code: BIDDER_CODE,
+  gvlid: GVLID,
   supportedMediaTypes: [BANNER, VIDEO, NATIVE],
 
   isBidRequestValid: isBidRequestValid(),