ci: fix: remove staging banner from production docker image (#71)

Author: BracketJohn

.drone.yml

@@ -84,8 +84,6 @@ data:
           value_from_secret: auction-ui/auctions.makerdao.network/frontend/infura_project_id
         - key: CONTACT_EMAIL
           value_from_secret: auction-ui/auctions.makerdao.network/frontend/contact_email
-        - key: STAGING_BANNER_URL
-          value_from_secret: auction-ui/main.auction-ui.k8s.sidestream.tech/frontend/staging_banner_url
         - key: DEFAULT_ETHEREUM_NETWORK
           value_from_secret: auction-ui/main.auction-ui.k8s.sidestream.tech/frontend/default_etherum_network
       tags_to_cache_from: