fix: user sync 設定

Author: 村橋克也

config/config.go

@@ -564,7 +564,7 @@ func (cfg *Configuration) GetCachedAssetURL(uuid string) string {
 // For example, the typical Bidder's usersync URL includes the PBS config.external_url, because it redirects to the `external_url/setuid` endpoint.
 //
 func (cfg *Configuration) setDerivedDefaults() {
-	externalURL := "https://prebid-server.flux-adserver.com"
+	externalURL := cfg.ExternalURL
 	if os.Getenv("ENV") == "flux" {
 		setDefaultUsersync(cfg.Adapters, openrtb_ext.BidderAJA, "https://ad.as.amanad.adtdp.com/v1/sync/ssp?ssp=4&gdpr={{.GDPR}}&us_privacy={{.USPrivacy}}&redir="+url.QueryEscape(externalURL)+"%2Fsetuid%3Fbidder%3Daja%26gdpr%3D{{.GDPR}}%26gdpr_consent%3D{{.GDPRConsent}}%26uid%3D%25s")
 		setDefaultUsersync(cfg.Adapters, openrtb_ext.BidderAppnexus, "https://ib.adnxs.com/getuid?"+url.QueryEscape(externalURL)+"%2Fsetuid%3Fbidder%3Dadnxs%26gdpr%3D{{.GDPR}}%26gdpr_consent%3D{{.GDPRConsent}}%26uid%3D%24UID")