aarch64-linux

https://github.com/input-output-hk/bech32/blob/7ff754b1109e71192a4307ce37645e94ec03f065/flake.nix#L16

```
… while evaluating attribute 'buildCommand' of derivation 'docker-image-devnet-xc.tar.gz'

at /nix/store/sql9ggq8nr9w8z7s71mqp8jdzvizhc1i-source/pkgs/build-support/trivial-builders/default.nix:87:14:

86| enableParallelBuilding = true;
87| inherit buildCommand name;
| ^
88| passAsFile = [ "buildCommand" ]

(stack trace truncated; use '--show-trace' to show the full trace)

error: attribute 'aarch64-linux' missing

at /nix/store/lciz8f2y6g0fc7lfp6m799ywdpg180g0-source/flake/cosmos.nix:6:18:

5| gex = self.inputs.cosmos.packages.${system}.gex;
6| bech32 = self.inputs.bech32.packages.${system}.default;
| ^
7| };
Stopped watching /nix/store and waiting for queue to empty ...
```