Adds support for Portuguese Holidays

src/Countries/Portugal.php

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+<?php
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+
+class Portugal extends Country
+{
+    public function countryCode(): string
+    {
+        return 'pt';
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    protected function allHolidays(int $year): array
+    {
+        return array_merge([
+            'Dia de Ano Novo' => '01-01',
+            'Dia da Liberdade' => '04-25',
+            'Dia do Trabalhador' => '05-01',
+            'Dia de Portugal' => '06-10',
+            'Assunção da Nossa Senhora' => '08-15',
+            'Implantação da República' => '10-05',
+            'Dia de Todos os Santos' => '11-01',
+            'Restauração da Independência' => '12-01',
+            'Imaculada Conceição' => '12-08',
+            'Natal' => '12-25'       
+        ], $this->variableHolidays($year));
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    protected function variableHolidays(int $year): array
+    {
+        $easter = CarbonImmutable::createFromTimestamp(easter_date($year))
+            ->setTimezone('Europe/Lisbon');
+
+        return [
+            'Páscoa' => $easter,
+            'Carnaval' => $easter->subDays(47),
+            'Sexta-feira Santa' => $easter->subDays(2),
+            'Corpo de Deus' => $easter->addDays(60),
+        ];
+    }
+}

tests/.pest/snapshots/Countries/PortugalTest/it_can_calculate_portuguese_holidays.snap

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+[
+    {
+        "name": "Dia de Ano Novo",
+        "date": "2024-01-01"
+    },
+    {
+        "name": "Carnaval",
+        "date": "2024-02-13"
+    },
+    {
+        "name": "Sexta-feira Santa",
+        "date": "2024-03-29"
+    },
+    {
+        "name": "P\u00e1scoa",
+        "date": "2024-03-31"
+    },
+    {
+        "name": "Dia da Liberdade",
+        "date": "2024-04-25"
+    },
+    {
+        "name": "Dia do Trabalhador",
+        "date": "2024-05-01"
+    },
+    {
+        "name": "Corpo de Deus",
+        "date": "2024-05-30"
+    },
+    {
+        "name": "Dia do Portugal",
+        "date": "2024-06-10"
+    },
+    {
+        "name": "Assun\u00e7\u00e3o da Nossa Senhora",
+        "date": "2024-08-15"
+    },
+    {
+        "name": "Implanta\u00e7\u00e3o da Rep\u00fablica",
+        "date": "2024-10-05"
+    },
+    {
+        "name": "Dia de Todos os Santos",
+        "date": "2024-11-01"
+    },
+    {
+        "name": "Restaura\u00e7\u00e3o da Independ\u00eancia",
+        "date": "2024-12-01"
+    },
+    {
+        "name": "Imaculada Concei\u00e7\u00e3o",
+        "date": "2024-12-08"
+    },
+    {
+        "name": "Natal",
+        "date": "2024-12-25"
+    }
+]

tests/Countries/PortugalTest.php

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+<?php
+
+namespace Spatie\Holidays\Tests\Countries;
+
+use Carbon\CarbonImmutable;
+use Spatie\Holidays\Holidays;
+
+it('can calculate portuguese holidays', function () {
+    CarbonImmutable::setTestNowAndTimezone('2024-01-01');
+
+    $holidays = Holidays::for(country: 'pt')->get();
+
+    expect($holidays)
+        ->toBeArray()
+        ->not()->toBeEmpty();
+
+    expect(formatDates($holidays))->toMatchSnapshot();
+
+});