nginx refresh page not 404

Dockerfile

@@ -16,6 +16,9 @@ RUN npm run build
 # 👉 Production stage
 FROM nginx:stable-alpine
 
+COPY default.conf /etc/nginx/conf.d/default.conf
+# ❗ถ้าอยากใช้ custom nginx.conf (optional)
+# COPY nginx.conf /etc/nginx/nginx.conf
 # คัดลอกไฟล์ที่ build แล้ว ไปยัง nginx
 COPY --from=builder /app/dist /usr/share/nginx/html
 

default.conf

+server {
+  listen 80;
+  server_name localhost;
+
+  root /usr/share/nginx/html;
+  index index.html;
+
+  location / {
+    try_files $uri $uri/ /index.html;
+  }
+}
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nginx.conf

+user  nginx;
+worker_processes  auto;
+
+error_log  /var/log/nginx/error.log warn;
+pid        /var/run/nginx.pid;
+
+events {
+  worker_connections  1024;
+}
+
+http {
+  include       /etc/nginx/mime.types;
+  default_type  application/octet-stream;
+
+  sendfile        on;
+  keepalive_timeout  65;
+
+  include /etc/nginx/conf.d/*.conf;  # 🔥 load default.conf จาก conf.d
+}
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