Certbot fails when host has only IPv6 and no IPv4 address

[pzauner]

Checklist

• Have you pulled and found the error with jc21/nginx-proxy-manager:latest docker image?
  • Yes
• Are you sure you're not using someone else's docker image?
  • Yes
• Have you searched for similar issues (both open and closed)?
  • Yes

Describe the bug
Certbot will fail when requesting a new ssl certificate, if you only have an IPv6-address. If you run certbot on the host, you will get a ssl cert just fine.

Nginx Proxy Manager Version
v2.12.3

To Reproduce
Steps to reproduce the behavior:

1. Have a server without an IPv4 address (e.g. one from v6node.com).

2. Install NPM.

3. Make sure your AAAA record is correctly set and propagated for your domain. (A records? Where we are going, we don't need A records...)

4. In NPM: request new ssl cert for your domain and accept TOS.

5. Admire error page:
   `debug log to /tmp/letsencrypt-log/letsencrypt.log
   An unexpected error occurred:
   ValueError: Requesting acme-v02.api.letsencrypt.org/directory: Network is unreachable
   Ask for help or search for solutions at https://community.letsencrypt.org. See the logfile /tmp/letsencrypt-log/letsencrypt.log or re-run Certbot with -v for more details.

   at /app/lib/utils.js:16:13
   at ChildProcess.exithandler (node:child_process:430:5)
   at ChildProcess.emit (node:events:518:28)
   at maybeClose (node:internal/child_process:1104:16)
   at ChildProcess._handle.onexit (node:internal/child_process:304:5)`

If you add an IPv4-address however, it just runs fine... Also runs fine on host without IPv4, just not via docker.

Expected behavior
Add new ssl cert to the list.

Operating System
Debian, x86

[github-actions]

Issue is now considered stale. If you want to keep it open, please comment 👍