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/DefaultConfig.ts

@@ -78,6 +78,9 @@ export abstract class DefaultServerConfig implements ServerConfig {
   cloudflareApiToken(): string {
     return process.env.CF_API_TOKEN ?? "";
   }
+  cloudflareConfigDir(): string {
+    return process.env.CF_CONFIG_DIR ?? "";
+  }
   private publicKey: JWK;
   abstract jwtAudience(): string;
   jwtIssuer(): string {