merge-after-ci, tea-create-pr: use writeShellApplication

flake-parts/merge-after-ci/default.nix

@@ -1,26 +1,25 @@
 {
   perSystem =
-    { config
-    , pkgs
+    { pkgs
     , self'
     , ...
     }:
     let
       name = builtins.baseNameOf ./.;
-      script = config.writers.writePureShellScriptBin
-        name
-        [
+      script = pkgs.writeShellApplication {
+        inherit name;
+        runtimeInputs = [
           pkgs.bash
           pkgs.coreutils
           pkgs.git
           pkgs.tea
           pkgs.openssh
           self'.packages.tea-create-pr
-        ]
-        ''
-          export EDITOR=${pkgs.vim}/bin/vim
+        ];
+        text = ''
           bash ${./script.sh} "$@"
         '';
+      };
     in
     {
       packages.${name} = script;