feat: add Installation Test Action (#1)

_test/demo-package/.gitignore

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+vendor/

_test/demo-package/README.md

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+# Magento 2 Demo Package
+
+It does nothing, intentionally...

_test/demo-package/Test/Integration/TestItWorks.php

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+<?php
+
+namespace Graycore\DemoPackage\Test\Integration;
+
+class TestItWorks extends \PHPUnit\Framework\TestCase
+{
+
+    public function testItWorks()
+    {
+        $this->assertEquals(true, true);
+    }
+}

_test/demo-package/Test/Unit/TestItWorks.php

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+<?php
+
+namespace Graycore\DemoPackage\Test\Unit;
+
+class TestItWorks extends \PHPUnit\Framework\TestCase
+{
+
+    public function testItWorks()
+    {
+        $this->assertEquals(true, true);
+    }
+}

_test/demo-package/composer.json

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+{
+    "name": "graycore/magento2-demo-package",
+    "description": "A Magento 2 Demostration Package",
+    "type": "magento2-module",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Damien Retzinger",
+            "email": "damienwebdev@gmail.com"
+        }
+    ],
+    "archive": {
+        "exclude": [
+            "/docs",
+            "/Test",
+            "README.md"
+        ]
+    },
+    "minimum-stability": "stable",
+    "autoload": {
+        "psr-4": {
+            "Graycore\\DemoPackage\\": ""
+        },
+        "files": [
+            "registration.php"
+        ]
+    },
+    "require": {
+        "magento/framework": "^102.0 || ^103.0"
+    },
+    "repositories": {
+        "0": {
+            "type": "composer",
+            "url": "https://repo.magento.com/"
+        }
+    },
+    "config": {
+        "preferred-install": "dist",
+        "sort-packages": true
+    }
+}

_test/demo-package/etc/module.xml

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+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
+    <module name="Graycore_DemoPackage" setup_version="1.0.0">
+        <sequence>
+            <module name="Magento_Framework" />
+        </sequence>
+    </module>
+</config>

_test/demo-package/registration.php

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+<?php declare(strict_types=1);
+
+use \Magento\Framework\Component\ComponentRegistrar;
+
+ComponentRegistrar::register(ComponentRegistrar::MODULE, 'Graycore_DemoPackage', __DIR__);