Docker login to private registry fails on normal run but succeeds when job is run with debugging enabled - timeout?

[robin-checkmk]

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So I want to pull images from a private registry to spin up service containers for my GitHub Actions.

my_container:
  image: my.registry.example/my_container:latest
  credentials:
    username: my_user
    password: my_password

Now when I run it just like that the job fails at the login step. Re-running the job in debug mode works, however. My intuition tells me, that in debug mode, timeouts are higher, allowing the login to succeed.

When doing a docker login locally, it works just fine, the only thing I notice is, that it literally takes some seconds.

I could not find anything about timeouts on the Internet for this topic. It seems like the only available configuration is the username and password.

If there is no solution, I would also take workarounds, like uploading the image by other means, so we can skip the docker login altogether.

Any help is appreciated!

[robin-checkmk]

Apparently I am the only one experiencing this, so I am going ahead and close the discussion. Have a nice day everyone.