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.

tests/util/TestServerConfig.ts

@@ -4,6 +4,9 @@ import { GameMapType } from "../../src/core/game/Game";
 import { GameID } from "../../src/core/Schemas";
 
 export class TestServerConfig implements ServerConfig {
+  cloudflareConfigDir(): string {
+    throw new Error("Method not implemented.");
+  }
   domain(): string {
     throw new Error("Method not implemented.");
   }