Nginx block robots.txt file

I managed to solve my problem by adding the command "rewrite" the policy server, as code below. After that, I returned to Google Webmasters, redid the search with the Googlebot and it worked. Take this opportunity to leave here my code that does the redirect port 80 to 443 prefix and non-www to www.

# Redirect HTTP to HTTPS and NON-WWW to WWW
server {
    listen 80;
    server_name domain.com.br;
    rewrite ^ https://www.domain.com.br$1 permanent;

# Rewrite the URLs.
    location / {
    try_files $uri $uri/ /index.php;
    }
}
server {
    listen 443;
    server_name www.domain.com.br;

# Rewrite the URLs.
    location / {
    try_files $uri $uri/ /index.php;
}

    root /usr/share/nginx/www;
    index index.php;

    [...] the code continued here

If you’re managing an environment similar to a production and want to keep bots from indexing traffic, it’s customary to add a robots.txt file at the root of your website to disallow all. Instead of creating a two-line plain text file, you can do this with only nginx:

location = /robots.txt {
  add_header  Content-Type  text/plain;
  return 200 "User-agent: *\nDisallow: /\n";
}

Add this into your configuration management as determined by environment, or add it by hand, and no longer worry if Google might start broadcasting your dev site to the world.

https://alan.ivey.dev/posts/2017/robots.txt-disallow-all-with-nginx/

Check out my answer here.

With regards to adding it to either your main nginx.conf file or your /etc/nginx/sites-available files, that's up to you, whether you want it to be global or site-specific, respectively.