[11.11] Add support for tier in Environments::create (#758)

Author: janfejtek

src/Api/Environments.php

@@ -44,6 +44,7 @@ public function all($project_id, array $parameters = [])
      *
      *     @var string $name         The name of the environment
      *     @var string $external_url Place to link to for this environment
+     *     @var string $tier         The tier of the new environment. Allowed values are production, staging, testing, development, and other.
      * }
      *
      * @return mixed
@@ -56,6 +57,8 @@ public function create($project_id, array $parameters = [])
             ->setAllowedTypes('name', 'string');
         $resolver->setDefined('external_url')
             ->setAllowedTypes('external_url', 'string');
+        $resolver->setDefined('tier')
+            ->setAllowedValues('tier', ['production', 'staging', 'testing', 'development', 'other']);
 
         return $this->post($this->getProjectPath($project_id, 'environments'), $resolver->resolve($parameters));
     }

tests/Api/EnvironmentsTest.php

@@ -155,12 +155,14 @@ public function shouldCreateEnvironment(): void
                 'name' => 'review/fix-baz',
                 'slug' => 'review-fix-baz-dfjre5',
                 'external_url' => 'https://review-fix-baz-dfjre5.example.gitlab.com',
+                'tier' => 'production',
             ],
         ];
 
         $params = [
             'name' => 'review/fix-baz',
             'external_url' => 'https://review-fix-baz-dfjre5.example.gitlab.com',
+            'tier' => 'production',
         ];
 
         $api = $this->getApiMock();