Hey, I'm trying to install nixos via a flake, etc. I get :

```warning: 'nix flake info' is a deprecated alias for 'nix flake metadata'
building the flake in git+file:///home/nixos/nixos/nix/nixos?ref=main&rev=4f5a7b971f45693ddc70255419aed267277f5a77...
error: builder for '/nix/store/n9i7zz9k38sa7i6wz536fg6yijgs265l-nmd.drv' failed with exit code 1;
       last 10 log lines:
       > Warning: Problem : HTTP error. Will retry in 1 seconds. 3 retries left.
       >   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
       > curl: (22) The requested URL returned error: 503
       > Warning: Problem : HTTP error. Will retry in 2 seconds. 2 retries left.
       >   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
       > curl: (22) The requested URL returned error: 503
       > Warning: Problem : HTTP error. Will retry in 4 seconds. 1 retries left.
       >   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
       > curl: (22) The requested URL returned error: 503
       > error: cannot download nmd from any mirror
       For full logs, run 'nix log /nix/store/n9i7zz9k38sa7i6wz536fg6yijgs265l-nmd.drv'.
(use '--show-trace' to show detailed location information)```