Use curl to install devenv

Author: dastarruer

.github/workflows/test.yml

@@ -19,7 +19,7 @@ jobs:
         with:
           name: devenv
       - name: Install devenv.sh
-        run: nix profile add nixpkgs#devenv
+        run: curl -fsSL https://devenv.sh/install | bash
 
       # Without nix unstable, an obscure builder error is thrown
       - name: Install nix unstable on macOS