feat(deploy) : add maintenance mode with automatic toggle during deploy

doc/deployment-docker.md

@@ -197,6 +197,23 @@ server {
     listen 80;
     server_name sirh.malio-dev.fr;
 
+    root /var/www/sirh/public;
+
+    # Maintenance mode
+    if (-f /var/www/sirh/maintenance.on) {
+        return 503;
+    }
+
+    error_page 503 @maintenance;
+
+    location @maintenance {
+        rewrite ^(.*)$ /maintenance.html break;
+    }
+
+    location = /maintenance.html {
+        internal;
+    }
+
     location / {
         proxy_pass http://127.0.0.1:8080;
         proxy_set_header Host $host;
@@ -207,9 +224,10 @@ server {
 }
 ```
 
-Activer le site :
+Copier la page de maintenance et activer le site :
 
 ```bash
+cp deploy/maintenance.html /var/www/sirh/public/maintenance.html
 sudo ln -sf /etc/nginx/sites-available/sirh.conf /etc/nginx/sites-enabled/sirh.conf
 sudo nginx -t && sudo systemctl reload nginx
 ```
@@ -251,6 +269,8 @@ rm /tmp/sirh.sql
 ├── config/jwt/
 │   ├── private.pem
 │   └── public.pem
+├── public/
+│   └── maintenance.html
 └── uploads/
 ```
 
@@ -266,7 +286,24 @@ cd /var/www/sirh
 ./deploy.sh v0.1.61   # deploie une version specifique
 ```
 
-C'est tout. Le script pull l'image, redemarre le conteneur, lance les migrations et vide le cache.
+Le script active automatiquement la maintenance pendant le deploy et la desactive a la fin.
+
+---
+
+## Maintenance manuelle
+
+Activer la maintenance (sans deployer) :
+
+```bash
+cd /var/www/sirh
+touch maintenance.on
+```
+
+Desactiver :
+
+```bash
+rm maintenance.on
+```
 
 ---