Error with Laravel Policies and Laravel Github Action

Hi everybody,

I'm currently working on a OpenSource Laravel API that will support the communication between personal trainers and their athletes.

For the first time, I'm trying using the Laravel GitHub action with the default configuration.

This is how the yml file look like:

name: Laravel

on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]

jobs:
  laravel-tests:

    runs-on: ubuntu-latest

    steps:
    - uses: shivammathur/setup-php@15c43e89cdef867065b0213be354c2841860869e
      with:
        php-version: '8.0'
    - uses: actions/checkout@v3
    - name: Copy .env
      run: php -r "file_exists('.env') || copy('.env.example', '.env');"
    - name: Install Dependencies
      run: composer install -q --no-ansi --no-interaction --no-scripts --no-progress --prefer-dist
    - name: Generate key
      run: php artisan key:generate
    - name: Directory Permissions
      run: chmod -R 777 storage bootstrap/cache
    - name: Create Database
      run: |
        mkdir -p database
        touch database/database.sqlite
    - name: Execute tests (Unit and Feature tests) via PHPUnit
      env:
        DB_CONNECTION: sqlite
        DB_DATABASE: database/database.sqlite
      run: vendor/bin/phpunit

I'll share you one of my migration, test, controller and policy:

create_category_table:

public function up()
    {
        Schema::create('categories', function (Blueprint $table) {
            $table->id();
            $table->foreignId('user_id')->constrained();
            $table->string('name');
            $table->string('description');
            $table->timestamps();
        });
    }

CategoryTest:

    public function test_get_category(): void
    {
        $user = User::factory()->create();
        Sanctum::actingAs($user);
        $category = Category::factory()->create(['user_id' => $user->id]);
        $response = $this->get('/api/category/'.$category->id);

        $response->assertStatus(200);
        $response->assertJson(['status' => 'success','category' => []]);
    }

CategoryController:

public function getCategory(\Illuminate\Http\Request $request): JsonResponse {
        $category = Category::find($request->id);
        if($category) {
            if($request->user()->cannot('view', $category)) {
                return response()->json(['error' => 'Unauthorized'], 401);
            }
            return response()->json(['status' => 'success', 'category' => $category]);
        }
        return response()->json(['status' => 'error', 'report' => 'Non è stata trovata nessuna categoria']);
    }

CategoryPolicy:

    public function view(User $user, Category $category)
    {
        return  $user->id === $category->user_id;
    }

GitHub Action:

1) Tests\Feature\CategoryTest::test_get_category
Expected response status code [200] but received 401.
Failed asserting that 200 is identical to 401.

/home/runner/work/gym-diary/gym-diary/vendor/laravel/framework/src/Illuminate/Testing/TestResponse.php:177
/home/runner/work/gym-diary/gym-diary/tests/Feature/CategoryTest.php:44

This seems to happen to every method that has a Policy.

Can anyone help me?

P.S: Of course, it works when I run the test locally

EDIT: CategoryFactory:

public function definition()
    {
        return [
            'name' => $this->faker->sentence(2),
            'description' => $this->faker->sentence(),
            'user_id' => User::factory()
        ];
    }