[SC-24749]: Per store/region maintenance page

docs/07-deploy-file/02-deploy.file.reference.v1.md

@@ -837,6 +837,67 @@ docker:
 Now you can access the applications from the `{ IP address 1 }` and `{ IP address 2 }` IP addresses.
 
 
+### Per-store and per-region maintenance pages
+
+By default, all endpoints of an application share the same maintenance page located at `public/{application}/maintenance/index.html` (e.g., `public/Yves/maintenance/index.html`).
+
+You can customize the maintenance page per store or per region by placing an `index.html` file in a subdirectory named after the store or region code:
+
+```
+public/Yves/maintenance/
+├── index.html          # Default maintenance page (fallback)
+├── EU/
+│   └── index.html      # Maintenance page for EU region
+├── US/
+│   └── index.html      # Maintenance page for US region
+├── DE/
+│   └── index.html      # Maintenance page for DE store (legacy store mode)
+└── AT/
+    └── index.html      # Maintenance page for AT store (legacy store mode)
+```
+
+The same structure applies to all applications (`Backoffice`, `MerchantPortal`, `Zed`, etc.).
+
+Nginx resolves the maintenance page using the following fallback order:
+
+**Dynamic store mode** (region-based endpoints):
+1. `maintenance/{region}/index.html` — region-specific page
+2. `maintenance/index.html` — default page
+
+**Legacy store mode** (store-based endpoints):
+1. `maintenance/{store}/index.html` — store-specific page
+2. `maintenance/{region}/index.html` — region-specific page
+3. `maintenance/index.html` — default page
+
+If no store-specific or region-specific page exists, the default `maintenance/index.html` is served. The default maintenance page is required and must always be present.
+
+#### Testing maintenance pages locally
+
+To verify a maintenance page locally without changing the deploy file, follow these steps:
+
+1. Boot the environment with your deploy file:
+```bash
+docker/sdk boot {deploy file name}
+```
+
+2. Open the generated `docker/deployment/default/docker-compose.yml` and add the `SPRYKER_MAINTENANCE_MODE_ENABLED` environment variable to the `frontend` service:
+```yaml
+services:
+  frontend:
+    image: ...
+    environment:
+      SPRYKER_MAINTENANCE_MODE_ENABLED: 1
+```
+
+3. Start the environment:
+```bash
+docker/sdk up
+```
+
+4. Open Yves in a browser — the maintenance page should be displayed.
+
+> **Note:** `docker/deployment/default/docker-compose.yml` is a generated file and will be overwritten the next time `docker/sdk boot` is run. This approach is intended for temporary local testing only. Do not commit this change.
+
 
 ### docker: logs:
 * `docker: logs: path:` defines the path to the directory with Docker logs. This variable is optional. If not specified, the default value applies: `path: '/var/log/spryker`.

generator/src/templates/nginx/conf.d/frontend.default.conf.twig

@@ -44,7 +44,8 @@ server {
     zedHost: zedHost,
     timeout: applicationData['http']['timeout'] | default('1m'),
     project: _context,
-    regionEndpointMap: _context['regionEndpointMap'][endpointData['identifier']]
+    regionEndpointMap: _context['regionEndpointMap'][endpointData['identifier']],
+    groupRegion: groupData['region'],
 } %}
 {% endfor %}
 {% endfor %}

generator/src/templates/nginx/http/application.server.conf.twig

@@ -56,4 +56,12 @@
         fastcgi_param SPRYKER_JENKINS_CSRF_PROTECTION_ENABLED {{ (services['scheduler']['csrf-protection-enabled'] | default(false)) ? 1 : 0 }};
 {% endblock location %}
     }
+
+    location @maintenance {
+{% if endpointData['region'] is defined %}
+        try_files /maintenance/{{ endpointData['identifier'] }}/index.html /maintenance/index.html =503;
+{% else %}
+        try_files /maintenance/{{ endpointData['identifier'] }}/index.html /maintenance/{{ groupRegion }}/index.html /maintenance/index.html =503;
+{% endif %}
+    }
 {% endblock locations %}

generator/src/templates/nginx/http/error.conf.twig

@@ -1,3 +1,3 @@
     error_page 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 422 425 426 428 429 431 451 /errorpage/4xx.html;
     error_page 500 501 502 504 505 506 507 508 509 510 511 /errorpage/5xx.html;
-    error_page 503 /maintenance/index.html;
+    error_page 503 @maintenance;