Como usar um nginx.conf personalizado no GKE

http {   include /etc/nginx/mime.types;   server_tokens off;   client_max_body_size 32m;    upstream app_server {     server localhost:8081;     keepalive 128;   }    endpoints {     metadata_server;   }    server {     # Running port     listen 8080;      # Running ssl port     listen 443 ssl;     ssl_certificate /etc/nginx/ssl/nginx.crt;     ssl_certificate_key /etc/nginx/ssl/nginx.key;      # Logging to stdout enables better integration with Docker and GKE/Kubernetes.     access_log /dev/stdout;      location / {       # Begin Endpoints v2 Support       endpoints {         on;         # After ESP 1.7.0, "server_config" field is required.         # It has to be /etc/nginx/server_config.pb.txt exactly.         # If not present, some new features will not work.         server_config /etc/nginx/server_config.pb.txt;          # After ESP 1.7.0, "api" field is not required.         # If added, it has to be /etc/nginx/endpoints/service.json exactly.         # api /etc/nginx/endpoints/service.json;          # Uncomment the line below if you are not using Google Container Engine.         # The path should be set to the “-k” path specified in the ESP container’s                          # args section in the Kubernetes yaml config.         # google_authentication_secret /etc/nginx/creds/service-account-creds.json;       }       # End Endpoints v2 Support        proxy_pass http://app_server;       proxy_redirect off;       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-Host $server_name;       proxy_set_header X-Google-Real-IP $remote_addr;        # 86400 seconds (24 hours) is the maximum a server is allowed.       proxy_send_timeout 86400s;       proxy_read_timeout 86400s;     }      include /var/lib/nginx/extra/*.conf;   }    server {     # expose /nginx_status but on a different port to avoid     # external visibility / conflicts with the app.     listen 8090;     location /nginx_status {       stub_status on;       access_log off;     }     location / {       root /dev/null;     }   } }

template:   metadata:     labels:       app: esp-echo   spec:     volumes:     - name: nginx-config       configMap:         name: nginx-config     - name: nginx-ssl       secret:         secretName: nginx-ssl     containers:     - name: esp       image: gcr.io/endpoints-release/endpoints-runtime:1       args: [         "-n", "/etc/nginx/custom/nginx.conf",         "-s", "SERVICE_NAME",         "--rollout_strategy", "managed",       ]       ports:         - containerPort: 8080         - containerPort: 443       volumeMounts:       - mountPath: /etc/nginx/ssl         name: nginx-ssl         readOnly: true       - mountPath: /etc/nginx/custom         name: nginx-config         readOnly: true     - name: echo        image: gcr.io/endpoints-release/echo:latest       ports:         - containerPort: 8081