tea-create-pr: get rid of runtime nix eval

...instead use our treefmt wrapper derivation which is exactly the same
but doesn't require an eval at runtime

pkgs/tea-create-pr/default.nix

@@ -5,6 +5,8 @@
   git,
   tea,
   openssh,
+  # our formatter
+  formatter,
 }:
 writeShellApplication {
   name = "tea-create-pr";
@@ -14,6 +16,9 @@ writeShellApplication {
     git
     tea
     openssh
+
+    # our treefmt formatter wrapped with correct config
+    formatter
   ];
   text = builtins.readFile ./script.sh;
 }

pkgs/tea-create-pr/script.sh

@@ -29,7 +29,7 @@ if ! check_remote "$remoteUpstream"; then
   exit 1
 fi
 
-nix fmt -- --fail-on-change --no-cache
+treefmt --fail-on-change --no-cache
 
 upstream_url=$(git remote get-url "$remoteUpstream")
 set -x