ci(devenv): update devenv install command

Author: xenOs76

.github/workflows/codeChecks.yml

@@ -48,7 +48,7 @@ jobs:
         with:
           name: devenv
       - name: Install devenv.sh
-        run: nix profile install nixpkgs#devenv
+        run: nix profile add nixpkgs#devenv
 
       - name: Build the devenv shell and run any pre-commit hooks
         run: devenv test