A plugin? That’s cups code from your app.yml, right? Are you trying to add another certificate? Like in Set up Let’s Encrypt with multiple domains / redirects Can you include the actual code and both certificates?
As you point out, that runit no longer exists, and now that magic is in /usr/local/bin/letsencrypt (inside the container)
I think maybe you want something like this if your site is www.mysite.org and you also want it to have a cert for forum.mysite.org:
- replace:
filename: "/usr/local/bin/letsencrypt"
from: "/-d www.mysite.org/"
to: "-d www.mysite.org -d forum.mysite.org "
global: true
What I would do (which may be of no help to you) is enter the container, apt update;apt install -y vim and then edit /usr/local/bin/letsencrypt such that it would request the certificates you want.
I added code to the let’s encrypt topic linked above that should let you enter your domain and get code that you can copy/paste into your app.yml.