Try to fix non-existent builds

Somehow I'm ending up with no file. Try to diagnose why, but also try to
fix it at the same problem without being 100% sure of the root cause

.gitlab-ci.yml

@@ -26,7 +26,8 @@ build:
   tags:
     - nix
   script:
-    - nix build -L ".#${ARCH}"
+    - nix run -L ".#${ARCH}"
+    - ls -l
     - URL=$CI_API_V4_URL/projects/$CI_PROJECT_ID/packages/generic/sword-utils/$TAG/sword-${ARCH}-${TAG}.tar.xz
     - >-
       if [ "$CI_COMMIT_BRANCH" == "main" ]; then

flake.nix

@@ -83,11 +83,18 @@
                     }
                   );
                 in
-                pkgs.writeShellScriptBin "package-sword" ''
+                pkgs.writeShellApplication {
-                  out=$(pwd)
+                  name = "package-sword";
-                  pushd ${svnSword}
+                  runtimeInputs = with pkgs; [
-                  ${pkgs.gnutar}/bin/tar cvhaf $out/sword.tar.xz * --transform "s+^+sword/+"
+                    gnutar
-                '';
+                    xz
+                  ];
+                  text = ''
+                    out=$(pwd)
+                    pushd ${svnSword}
+                    tar cvhaf "$out/sword.tar.xz" ./* --transform "s+^\\./+sword/+"
+                  '';
+                };
             in
             with pkgs.pkgsCross;
             {