fix(compose): strip UTF-8 BOM before parsing Docker Compose YAML (#12223)

tests/Unit/DockerComposeByteOrderMarkTest.php

@@ -0,0 +1,17 @@
+<?php
+
+use Tests\TestCase;
+
+uses(TestCase::class);
+
+it('parses a Docker Compose file that starts with a UTF-8 byte order mark', function () {
+    $compose = "\xEF\xBB\xBFservices:\n  web:\n    image: nginx:alpine\n";
+
+    expect(parseDockerComposeYaml($compose))->toBe([
+        'services' => [
+            'web' => ['image' => 'nginx:alpine'],
+        ],
+    ]);
+
+    validateDockerComposeForInjection($compose);
+});