Update build-sm64.yml

.github/workflows/build-sm64.yml

@@ -18,7 +18,13 @@ jobs:
           # Install Nix as a daemon
           sh <(curl -L https://nixos.org/nix/install) --daemon
           
-          # Source the correct profile
+          # Source the correct profile and set up environment variables
+          NIX_LINK=$HOME/.nix-profile
+          export NIX_PROFILES="/nix/var/nix/profiles/default:$NIX_LINK"
+          export XDG_DATA_DIRS="/usr/local/share:/usr/share:$NIX_LINK/share:/nix/var/nix/profiles/default/share"
+          export PATH="$NIX_LINK/bin:/nix/var/nix/profiles/default/bin:$PATH"
+          
+          # Source nix.sh to update the environment
           . /home/runner/.nix-profile/etc/profile.d/nix.sh
           
           # Install Devenv