fix memory leak and remove 'add'

src/main.zig

@@ -120,6 +120,8 @@ fn configLocation(allocator: Allocator) ![]const u8 {
     return config_location;
 }
 
+/// Reads the config file into a list of OtpAuthUrl.
+/// The caller is responsible to free the memory.
 fn read_config(allocator: Allocator, config_location: []const u8) !ArrayList(OtpAuthUrl) {
     const file = try std.fs.cwd().openFile(config_location, .{});
     defer file.close();
@@ -142,6 +144,7 @@ fn executeGetList(allocator: Allocator, config_location: []const u8) !std.ArrayL
     var names = std.ArrayList([]const u8).init(allocator);
 
     const authenticators = try read_config(allocator, config_location);
+    defer authenticators.deinit();
 
     for (0..authenticators.items.len) |i| {
         try names.append(authenticators.items[i].name);
@@ -162,6 +165,7 @@ test "read list of entries" {
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
     const allocator = gpa.allocator();
 
+    std.fs.cwd().deleteTree("test-tmp") catch unreachable;
     try std.fs.cwd().makeDir("test-tmp");
     const file = try std.fs.cwd().createFile("test-tmp/zig-totp", .{ .read = true });
     defer {