magic eight ball, does it work like this?

.circleci/config.yml

@@ -145,9 +145,9 @@ jobs:
 
       - run:
           name: "Report Coverage"
+          shell: "/usr/bin/env nix-shell"
           command: |
-            #! /usr/bin/env nix-shell
-            #! nix-shell -p "python.withPackages (ps: [ ps.codecov ])"
+            #! nix-shell -i bash -p "python.withPackages (ps: [ ps.codecov ])"
             cp ./result-doc/share/doc/*/.coverage ./
             python -m coverage combine
             python -m coverage report