fix cloudflare tunnels (#1076)

The Server didn't have correct permissions to create the directory for
the cloudflare config. Have docker do it instead. Also the credentials
file key was incorrect.

src/core/configuration/Config.ts

@@ -60,6 +60,7 @@ export interface ServerConfig {
   subdomain(): string;
   cloudflareAccountId(): string;
   cloudflareApiToken(): string;
+  cloudflareConfigDir(): string;
 }
 
 export interface NukeMagnitude {