Get Nix Flake to include git submodule

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Here’s what happens with most recent Nix 2.31.3:

 > nix run github:NixOS/nix/2.31.3 -- build -L https://github.com/jakubgs/nix-submodule-bug-repro
error:
       … while fetching the input 'https://github.com/jakubgs/nix-submodule-bug-repro'

       error: Failed to open archive (Unrecognized archive format)

 > nix run github:NixOS/nix/2.31.3 -- build -L github:jakubgs/nix-submodule-bug-repro
nix-submodule-bug-repro> cp: cannot stat '/nix/store/8z6yr8dcq3h4yf4rpsahvlyj8g6yd7iz-source/dummy-submodule/README.md': No such file or directory
error: builder for '/nix/store/66676knwjjkxd5jc40jj6p68j7fajcnv-nix-submodule-bug-repro.drv' failed with exit code 1;
       last 1 log lines:
       > cp: cannot stat '/nix/store/8z6yr8dcq3h4yf4rpsahvlyj8g6yd7iz-source/dummy-submodule/README.md': No such file or directory
       For full logs, run:
         nix log /nix/store/66676knwjjkxd5jc40jj6p68j7fajcnv-nix-submodule-bug-repro.drv

 > nix run github:NixOS/nix/2.31.3 -- build -L 'git+https://github.com/jakubgs/nix-submodule-bug-repro'


 > ls -l ./result/
total 1
-r--r--r-- 1 root root 41 Jan  1  1970 README.md

So it only works if you use the git+https:// format of the URL for some magical reason.

Also, it’s worth knowing contents of ~/.cache/nix can affect result of these commands so clearing that can help too.

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