feat: support non-TLD resolving server domains

See coop-cloud/organising#566

cli/internal/cli.go

@@ -193,7 +193,7 @@ var NewAppServerFlag = &cli.StringFlag{
 var NoDomainChecks bool
 var NoDomainChecksFlag = &cli.BoolFlag{
 	Name:        "no-domain-checks, D",
-	Usage:       "Disable app domain sanity checks",
+	Usage:       "Disable public DNS checks",
 	Destination: &NoDomainChecks,
 }