added build devshell in flake for min deps

flake.nix

@@ -72,6 +72,25 @@
           '';
         };
 
+        devShells.build = pkgs.mkShell {
+          nativeBuildInputs = with pkgs; [
+            zigpkgs.master
+          ];
+
+          buildInputs = with pkgs; [
+            # we need a version of bash capable of being interactive
+            # as opposed to a bash just used for building this flake 
+            # in non-interactive mode
+            bashInteractive 
+          ];
+
+          shellHook = ''
+            # once we set SHELL to point to the interactive bash, neovim will 
+            # launch the correct $SHELL in its :terminal 
+            export SHELL=${pkgs.bashInteractive}/bin/bash
+          '';
+        };
+
         # For compatibility with older versions of the `nix` binary
         devShell = self.devShells.${system}.default;
       }