Tell NixOS the hell with purity and let /bin/bash shebangs work

configuration.nix

@@ -89,6 +89,11 @@
 
   # Add ~/.local/bin/ to $PATH
   environment.localBinInPath = true;
+  environment.homeBinInPath = true;  
+  # Only this works, from https://github.com/NixOS/nixpkgs/issues/157383#issuecomment-1186081648
+  environment.shellInit = ''
+    export PATH="$PATH:$HOME/.local/bin"
+  '';
 
   # Needed for Slack but probably helps other stuff too.
   # See https://wiki.nixos.org/wiki/Slack
@@ -131,6 +136,10 @@
     LC_TIME = "en_US.UTF-8";
   };
 
+  # Just make bin/bash work, see https://github.com/Mic92/envfs
+  # via the long, sad https://discourse.nixos.org/t/add-bin-bash-to-avoid-unnecessary-pain/5673/37
+  services.envfs.enable = true;
+
   # Via https://github.com/NixOS/nixos-hardware/tree/master/framework
   services.fwupd.enable = true;
   services.fwupd.extraRemotes = [ "lvfs-testing" ];