Unable to access private build status on gitlab

### Are you experiencing an issue with...

My own instance of shields

### 🐞 Description

Hi,

I'm running an instance via Docker on my server which is working perfectly.
But when I want to add a status from a private repo from gitlab I get a inaccessible badge.

Here my setup:
Docker tag: server-2022-12-01
Docker-config service:
`shields:
image: shieldsio/shields:server-2022-12-01
container_name: Shields
environment:
- PORT=80
- GITLAB_ORIGINS=https://gitlab.com
- GITLAB_TOKEN=glpat-sometokenkeyhere`

I checked the token is valid and grant all access (for testing purpose)

At the same time sometimes 8n the logs of Shields docker I got this error:

`Shields | 0103155818 Error: Token pool is exhausted
Shields | at TokenPool._nextBatch (file:///usr/src/app/core/token-pooling/token-pool.js:268:11)
Shields | at TokenPool.next (file:///usr/src/app/core/token-pooling/token-pool.js:305:20)
Shields | at GithubApiProvider.tokenForUrl (file:///usr/src/app/services/github/github-api-provider.js:147:33)
Shields | at GithubApiProvider.fetch (file:///usr/src/app/services/github/github-api-provider.js:160:22)
Shields | at GithubForks._request (file:///usr/src/app/core/base-service/base.js:234:40)
Shields | at GithubForks._requestGraphql (file:///usr/src/app/core/base-service/base-graphql.js:74:35)
Shields | at GithubForks._requestGraphql (file:///usr/src/app/services/github/github-auth-service.js:66:18)
Shields | at GithubForks.handle (file:///usr/src/app/services/github/github-forks.service.js:57:29)
Shields | at Function.invoke (file:///usr/src/app/core/base-service/base.js:407:45)`

I don't know if it's related.

Thanks in advance.

### 🔗 Link to the badge

_No response_

### 💡 Possible Solution

_No response_

Reproduce the private GitLab status badge using the shown Docker configuration and inspect the container logs. Compare the GitLab request path with the reported core/token-pooling/token-pool.js and services/github/github-api-provider.js stack trace. Done means the private GitLab badge returns an accessible status and the cause of the token-pool error is identified.

Written by the indexing model from the issue text.