I've been a fan of dokuwiki for years and years, going back to my startup in 2005 when I used it to document our designs, usage, actions, etc. It's similar to the popular Mediawiki but offers better ACL. I've set it up multiple times in multiple ways, always a little concerned about security. I've had installed plugins with security flaws and it's just hard to stay on top. Most of the time I've deployed it for internal use inside a firewall.
Having worked at a startup for over 2 years that's heavily invested in docker, I've gotten to know docker really well. Not having had a website for quite a while, I finally decided to dip my toe in the water again using docker to contain my dokuwiki site.
Bitnami seems to do a very nice job wrapping up applications with persistent data and configuration. The documentation is quite good. I had a little trouble turning on “nice links” since these require htaccess, and bitnami does a nice job of creating a secure deployment that you should leverage. If you aren't careful you could break their secure implementation, which I did at first trying to figure out what was going on.
The persistence, of course, is key for easy upgrades of dokuwiki. Just tear down and bring up the new container!
Letsencrypt is always easy to deploy and I've folded that in. Recently I've leaned towards not using “www”, supported using directs. All folded in for http and https.