Narrow the cache of xdg directory (#20)

Narrow the cache of xdg directory per request from @savil

Author: LucilleH

action.yml

@@ -122,7 +122,8 @@ runs:
       uses: actions/cache@v3
       with:
         path: |
-          ~/.cache
+          ~/.cache/devbox
+          ~/.cache/nix
           ~/.local/state/nix
           ~/.nix-defexpr
           ~/.nix-profile