server {
    listen 80;
    root /usr/share/nginx/html;
    index index.html;

    # a new build replaces these files in place, so have clients check
    add_header Cache-Control "no-cache";

    location ~ \.apk$ {
        default_type application/vnd.android.package-archive;
        add_header Cache-Control "no-cache";
    }
    location = /SHA256SUMS {
        default_type text/plain;
        add_header Cache-Control "no-cache";
    }
    location / {
        try_files $uri $uri/ =404;
    }
}