Move cloudflare tunnel creation back into startup.sh (#2694)

## Description:
Reverts #49b01d8

Move cloudflare tunnel creation back into startup.sh. This keeps the
infra outside of the main app.
## Please complete the following:

- [ ] I have added screenshots for all UI updates
- [ ] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [ ] I have added relevant tests to the test directory
- [ ] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

src/core/configuration/Config.ts

@@ -59,10 +59,6 @@ export interface ServerConfig {
   jwkPublicKey(): Promise<JWK>;
   domain(): string;
   subdomain(): string;
-  cloudflareAccountId(): string;
-  cloudflareApiToken(): string;
-  cloudflareConfigPath(): string;
-  cloudflareCredsPath(): string;
   stripePublishableKey(): string;
   allowedFlares(): string[] | undefined;
   enableMatchmaking(): boolean;

src/core/configuration/DefaultConfig.ts

@@ -102,18 +102,6 @@ export abstract class DefaultServerConfig implements ServerConfig {
   subdomain(): string {
     return process.env.SUBDOMAIN ?? "";
   }
-  cloudflareAccountId(): string {
-    return process.env.CF_ACCOUNT_ID ?? "";
-  }
-  cloudflareApiToken(): string {
-    return process.env.CF_API_TOKEN ?? "";
-  }
-  cloudflareConfigPath(): string {
-    return process.env.CF_CONFIG_PATH ?? "";
-  }
-  cloudflareCredsPath(): string {
-    return process.env.CF_CREDS_PATH ?? "";
-  }
 
   private publicKey: JWK;
   abstract jwtAudience(): string;