feat: add code and CI

.github/workflows/qa.yml

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+name: QA
+
+on: [pull_request]
+
+jobs:
+  php-cs-fixer:
+    name: PHP-CS-Fixer
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@master
+
+      - name: PHP-CS-Fixer
+        uses: docker://jakzal/phpqa:1.96.3-php8.2-alpine
+        with:
+          args: php-cs-fixer --dry-run --diff --no-interaction --ansi fix --show-progress none src/

.github/workflows/tests.yml

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+name: Tests
+
+on: [pull_request]
+
+jobs:
+  tests:
+    name: Test
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup PHP, with extensions
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.2
+          extensions: intl
+
+      - name: Run tests
+        run: php -f ./src/script.php

.gitignore

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+.php-cs-fixer.cache
+/vendor/

.php-cs-fixer.dist.php

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+<?php
+
+declare(strict_types=1);
+
+$finder = PhpCsFixer\Finder::create()
+    ->in(__DIR__.'/src')
+;
+
+$config = new PhpCsFixer\Config();
+
+$config
+    ->setFinder($finder)
+    ->setRiskyAllowed(true)
+;
+
+return $config;

src/script.php

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+<?php
+
+declare(strict_types=1);
+
+$fmt = new IntlDateFormatter(
+    'fr_FR',
+    IntlDateFormatter::FULL,
+    IntlDateFormatter::FULL,
+    'America/Los_Angeles',
+    IntlDateFormatter::GREGORIAN
+);
+
+echo 'Le premier format affiché est '.$fmt->format(0);
+
+exit(0);