Add ext-protobuf

config/pkg/ext/ext-protobuf.yml

@@ -0,0 +1,9 @@
+ext-protobuf:
+  type: php-extension
+  artifact:
+    source:
+      type: pecl
+      name: protobuf
+    metadata:
+      license-files: [LICENSE]
+      license: BSD-3-Clause

src/Package/Extension/protobuf.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Package\Extension;
+
+use Package\Target\php;
+use StaticPHP\Attribute\Package\Extension;
+use StaticPHP\Attribute\Package\Validate;
+use StaticPHP\Exception\ValidationException;
+use StaticPHP\Package\PackageInstaller;
+
+#[Extension('protobuf')]
+class protobuf
+{
+    #[Validate]
+    public function validate(PackageInstaller $installer): void
+    {
+        if (php::getPHPVersionID() < 80000 && getenv('SPC_SKIP_PHP_VERSION_CHECK') !== 'yes') {
+            throw new ValidationException('The latest protobuf extension requires PHP 8.0 or later');
+        }
+        $grpc = $installer->getPhpExtensionPackage('ext-grpc');
+        // protobuf conflicts with grpc
+        if ($grpc?->isBuildStatic()) {
+            throw new ValidationException('protobuf conflicts with grpc, please remove grpc or protobuf extension');
+        }
+    }
+}