Aggiunge proxy edge con pagina di cortesia e rilascio a downtime minimo.

NPM punta a nginx locale su :3000 che resta attivo durante il restart Rails; nuovo script release_production.sh esegue migrate, build e deploy in ordine.

Co-authored-by: Cursor <cursoragent@cursor.com>

infra/nginx-edge/nginx.conf

@@ -0,0 +1,85 @@
+events {
+    worker_connections 1024;
+}
+
+http {
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    # DNS Docker: risolve di nuovo l'IP di rails dopo ogni recreate container.
+    resolver 127.0.0.11 valid=5s ipv6=off;
+
+    map $http_upgrade $connection_upgrade {
+        default upgrade;
+        ''      close;
+    }
+
+    server {
+        listen 80;
+        server_name _;
+
+        client_max_body_size 20M;
+
+        set $rails_backend rails:3000;
+
+        location = /edge-health {
+            access_log off;
+            add_header Content-Type text/plain;
+            return 200 "ok\n";
+        }
+
+        # Health check ops: pass-through senza pagina di cortesia.
+        location = /up {
+            proxy_pass http://$rails_backend;
+            proxy_connect_timeout 2s;
+            proxy_read_timeout 10s;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+        }
+
+        location = /up/deep {
+            proxy_pass http://$rails_backend;
+            proxy_connect_timeout 2s;
+            proxy_read_timeout 30s;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+        }
+
+        location /cable {
+            proxy_pass http://$rails_backend;
+            proxy_http_version 1.1;
+            proxy_set_header Upgrade $http_upgrade;
+            proxy_set_header Connection $connection_upgrade;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+            proxy_read_timeout 86400;
+            proxy_connect_timeout 2s;
+            error_page 502 503 504 = @maintenance;
+        }
+
+        location / {
+            proxy_pass http://$rails_backend;
+            proxy_connect_timeout 2s;
+            proxy_read_timeout 120s;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+            error_page 502 503 504 = @maintenance;
+        }
+
+        location @maintenance {
+            internal;
+            root /usr/share/nginx/maintenance;
+            try_files /index.html =503;
+            add_header Retry-After 15 always;
+            add_header Cache-Control "no-store" always;
+        }
+    }
+}