I want to open a PR to frappe/bench from my fork.

[vishalkatsa]

Hi Frappe team,

I wanted to open a PR for a small backward-compatible improvement in bench, but GitHub says PRs are limited to collaborators.

Change summary:
This adds an optional --authenticator flag to bench setup lets-encrypt.

Default remains standalone, so existing behavior is unchanged.

Users can run:
bench setup lets-encrypt site.local --custom-domain example.com --authenticator nginx

This is useful for production setups where Nginx is already serving HTTP traffic on port 80, and Certbot’s nginx authenticator is preferred for HTTP-01 challenge handling and renewal workflows.

Changed files:

• bench/commands/setup.py
• bench/config/lets_encrypt.py
• bench/config/templates/letsencrypt.cfg
• bench/tests/test_letsencrypt.py
• docs/bench_usage.md

Branch:
https://github.com/vishalkatsa/bench/tree/feat/letsencrypt-authenticator-option

Tested with:
python3 -m unittest bench.tests.test_letsencrypt

Also tested on server:

• authenticator = nginx was generated in /etc/letsencrypt/renewal/<domain>.conf
• certbot renew --dry-run succeeded