Add mariadb example to DATABASE_URL (#1186)

* Add mariadb example to DATABASE_URL

* Apply change requests

* Use same casing as in the doctrine/dbal mariadb docs

See doctrine/dbal#5971

* Update doctrine/doctrine-bundle/2.8/manifest.json

Co-authored-by: Alexander M. Turek <[email protected]>

* Use only major version for postgresql serverVersion

---------

Co-authored-by: Alexander M. Turek <[email protected]>

Author: alexander-schranz

doctrine/doctrine-bundle/2.8/manifest.json

@@ -11,7 +11,8 @@
         "#2": "IMPORTANT: You MUST configure your server version, either here or in config/packages/doctrine.yaml",
         "#3": "",
         "#4": "DATABASE_URL=\"sqlite:///%kernel.project_dir%/var/data.db\"",
-        "#5": "DATABASE_URL=\"mysql://app:[email protected]:3306/app?serverVersion=8&charset=utf8mb4\"",
+        "#5": "DATABASE_URL=\"mysql://app:[email protected]:3306/app?serverVersion=8.0.32&charset=utf8mb4\"",
+        "#6": "DATABASE_URL=\"mysql://app:[email protected]:3306/app?serverVersion=10.11.2-MariaDB&charset=utf8mb4\"",
         "DATABASE_URL": "postgresql://app:[email protected]:5432/app?serverVersion=15&charset=utf8"
     },
     "dockerfile": [