ajoute la liaison Laravel-OpenStack et le modèle Heat du lab 08

Un gabarit Heat généré depuis chaque lab.yaml, une stack par session de
lab (création à l'admission, suppression à l'expiration via des jobs
Redis et un worker systemd dédié). Passage du compte de service à une
authentification par mot de passe : Heat refuse de créer un trust à
partir d'un jeton d'application credential (voir ADR 0002).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

portail/composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "50c7a6013c4c05685d2a3b021614b26b",
+    "content-hash": "4bbbdac2ebdd2568b9a8375272d3a7be",
     "packages": [
         {
             "name": "bacon/bacon-qr-code",
@@ -6042,6 +6042,82 @@
             ],
             "time": "2026-08-30T20:10:52+00:00"
         },
+        {
+            "name": "symfony/yaml",
+            "version": "v7.4.20",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/yaml.git",
+                "reference": "0222bf4dfaa1e3ceb8fff579635d655f2950d5a7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/0222bf4dfaa1e3ceb8fff579635d655f2950d5a7",
+                "reference": "0222bf4dfaa1e3ceb8fff579635d655f2950d5a7",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2",
+                "symfony/deprecation-contracts": "^2.5|^3",
+                "symfony/polyfill-ctype": "^1.8"
+            },
+            "conflict": {
+                "symfony/console": "<6.4"
+            },
+            "require-dev": {
+                "symfony/console": "^6.4|^7.0|^8.0"
+            },
+            "bin": [
+                "Resources/bin/yaml-lint"
+            ],
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\Yaml\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Loads and dumps YAML files",
+            "homepage": "https://symfony.com",
+            "support": {
+                "source": "https://github.com/symfony/yaml/tree/v7.4.20"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/nicolas-grekas",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2026-09-26T06:31:10+00:00"
+        },
         {
             "name": "tijsverkoyen/css-to-inline-styles",
             "version": "v2.4.0",