Fix ExecStart in Bookwyrm systemd unit

bookwyrm.nix

@@ -5,6 +5,7 @@
 } :
 
 with builtins ;
+with pkgs ;
 with pkgs . kernelmaft . python ;
 with pkgs . python311Packages ;
 with stdenv ;
@@ -99,7 +100,7 @@ mkDerivation {
 		# Executables
 
 		cat <<- EOF > $out/bin/bookwyrm
-			#!/run/current-system/sw/bin/sh
+			#!${bash}/bin/sh
 
 			export PYTHONPATH="$out/lib/python3.11/site-packages"
 

nixos-module.nix

@@ -1,11 +1,12 @@
 { pkgs , ... } :
 
+with pkgs ;
+with pkgs . kernelmaft ;
+
 {
 	nixpkgs = {
 		overlays = [
 			( self : super :
-				with pkgs ;
-
 				{
 					kernelmaft = {
 
@@ -54,13 +55,13 @@
 
 	systemd = {
 		units = {
-			bookwyrm = {
+			"bookwyrm.service" = {
 				text = ''
 					[Unit]
 					After=network.target
 
 					[Service]
-					ExecStart=$out/bin/bookwyrm
+					ExecStart=${bookwyrm}/bin/bookwyrm
 					WorkingDirectory=/var/lib/bookwyrm
 				'' ;
 			} ;