warning: error: unable to download 'http://127.0.0.1:37515/nix-cache-info': HTTP error 503

[terlar]

When the action reaches the post run it says:

2023-06-27T21:28:03.180908Z  INFO magic_nix_cache::api: Workflow finished
    at magic-nix-cache/src/api.rs:50

2023-06-27T21:28:03.232509Z  INFO magic_nix_cache::api: Pushing 1171 new paths
    at magic-nix-cache/src/api.rs:59

warning: $HOME ('/github/home') is not owned by you, falling back to the one defined in the 'passwd' file ('/root')
warning: error: unable to download 'http://127.0.0.1:37515/nix-cache-info': HTTP error 503

Then it keeps failing with:

warning: error: unable to download 'http://127.0.0.1:37515/nix-cache-info': HTTP error 503

Is there any way to debug what is going on? Could it perhaps have something to do with me running everything via a container image:

    container:
      image: ghcr.io/terlar/nix:2.16.1-ubuntu