When running `wrangler deploy` add a `OPEN_NEXT_DEPLOY` environment variable to let wrangler know that it is being run by open-next#1023

vicb merged 7 commits intomainopennextjs/opennextjs-cloudflare:mainfrom

dario/add-RUN_BY_OEPN_NEXT-env-varopennextjs/opennextjs-cloudflare:dario/add-RUN_BY_OEPN_NEXT-env-varCopy head branch name to clipboard