build: allow building nightly archives via cron jobs (#26938)

build/ci.go

@@ -465,10 +465,6 @@ func maybeSkipArchive(env build.Environment) {
 		log.Printf("skipping archive creation because this is a PR build")
 		os.Exit(0)
 	}
-	if env.IsCronJob {
-		log.Printf("skipping archive creation because this is a cron job")
-		os.Exit(0)
-	}
 	if env.Branch != "master" && !strings.HasPrefix(env.Tag, "v1.") {
 		log.Printf("skipping archive creation because branch %q, tag %q is not on the inclusion list", env.Branch, env.Tag)
 		os.Exit(0)