updated docker file

nginx.conf

@@ -0,0 +1,26 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # go_router owns the URL, so any path that is not a real file has to come
+    # back as index.html rather than a 404 — otherwise a reload on /permissions
+    # or a shared link lands on nothing.
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Build output is content-hashed, the shell is not: caching index.html or
+    # the service worker would pin returning workers to the previous release.
+    location = /index.html {
+        add_header Cache-Control "no-cache, no-store, must-revalidate";
+    }
+    location = /flutter_service_worker.js {
+        add_header Cache-Control "no-cache, no-store, must-revalidate";
+    }
+
+    gzip on;
+    gzip_types text/plain text/css application/javascript application/json image/svg+xml application/wasm;
+    gzip_min_length 1024;
+}