buildGleamApplication: allow specifying runtime, create wrapper using runtime

nix/build-gleam-application.nix

···
       gleamNix,
       erlang ? inputs.erlang,
       gleam ? inputs.gleam,
+      jsRuntime ? null,
 
       target ? "erlang",
       buildGleamArgs ? { },
···
         erlang
         gleam
         target
+        jsRuntime
         ;
 
       nativeBuildInputs = nativeBuildInputs ++ [
···
               ${lib.concatMapStringsSep "\n" (package: "ln -s ${package}/* $out/lib/") compiledPackages}
 
               mv gleam_entrypoint.mjs $out/lib/
+
+              ${lib.optionalString (finalAttrs.jsRuntime != null) ''
+                makeWrapper ${lib.getExe finalAttrs.jsRuntime} $out/bin/${finalAttrs.pname} --add-flags \
+                  "${
+                    lib.optionalString (finalAttrs.jsRuntime.pname != "deno") "--preserve-symlinks"
+                  } $out/lib/gleam_entrypoint.mjs"
+              ''}
             ''
         }