[misc] nginx/compose: use docker-compose spec v3

[das7pad]

trafficstars

Proposed changes

Migrate the docker-compose file of the nginx auth example from v1 to v3.

Unreleased project version (optional)

Related issues (optional)

Followup for #9270

---

NOTE1: bcrypt is still not supported by the nginx:latest docker image

NOTE2: I tested the example using this minimal nginx config to omit the ssl setup:

events {
  worker_connections  1024;
}

http {
  upstream docker-registry {
    server registry:5000;
  }
  server {
    server_name _;
    listen 443;

    auth_basic "Registry realm";
    auth_basic_user_file /etc/nginx/conf.d/nginx.htpasswd;

    location /v2/ {
      proxy_pass http://docker-registry;
    }
  }
}

# curl testuser:[email protected]:5043/v2/ -i
HTTP/1.1 200 OK
Server: nginx/1.17.3
Date: Thu, 12 Sep 2019 23:30:14 GMT
Content-Type: application/json; charset=utf-8
Content-Length: 2
Connection: keep-alive
Docker-Distribution-Api-Version: registry/2.0
X-Content-Type-Options: nosniff

[GordonTheTurtle]

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[docker-robott]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions. As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

If the updates are still relevant, review our contribution guidelines and rebase your pull request against the latest version of the docs, then mark it as fresh with a /remove-lifecycle stale comment. If not, this pull request will be closed in 30 days. This helps our maintainers focus on the active pull requests.

Prevent pull requests from auto-closing with a /lifecycle frozen comment.

/lifecycle stale

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[das7pad]

In regards to https://github.com/docker/docs/pull/9441#discussion_r942268827 this is likely still of interest.

/remove-lifecycle stale

[docker-robott]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions. As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

If the updates are still relevant, review our contribution guidelines and rebase your pull request against the latest version of the docs, then mark it as fresh with a /remove-lifecycle stale comment. If not, this pull request will be closed in 30 days. This helps our maintainers focus on the active pull requests.

Prevent pull requests from auto-closing with a /lifecycle frozen comment.

/lifecycle stale

[das7pad]

In regards to https://github.com/docker/docs/pull/9441#discussion_r942268827 this is likely still of interest.

/remove-lifecycle stale