feat: persist file mode

src/main.zig

@@ -106,6 +106,7 @@ fn genfile(
 
     var content: []const u8 = undefined;
     var fname: ?[]const u8 = null;
+    var file_mode: std.fs.File.Mode = std.fs.File.default_mode;
     switch (file.content) {
         .string => |s| content = s,
         .path => |p| {
@@ -113,6 +114,7 @@ fn genfile(
             const path = try std.fs.path.join(std.heap.c_allocator, &.{ state.rootpath, p });
             defer std.heap.c_allocator.free(path);
 
+            file_mode = (try std.fs.cwd().statFile(path)).mode;
             const f = try std.fs.cwd().openFile(path, .{});
             defer f.close();
 
@@ -143,7 +145,7 @@ fn genfile(
         try std.fs.cwd().makePath(dir);
     }
 
-    var outfile = try std.fs.cwd().createFile(path, .{});
+    var outfile = try std.fs.cwd().createFile(path, .{ .mode = file_mode });
     defer outfile.close();
 
     try outfile.writeAll(out);