Managing Wordpress on Kubernates

My question is some what general, but could get more specific.

I installed a one-click wordpress install on a Digital Ocean Kubernates cluster and am realizing there are some nuances here!

Usually, I’d just FTP in to adjust files and change the WP-Config, however, there’s no FTP access, so…

How can one manage files, particularly the wp-config.php?

I understand this may vary depending on setup. I don’t know the details of the digital ocean one click wordpress build, but I’m also just asking in general:
How could this be done with kubernates?
If you happen to be able to tell me about this specific install, that’s great too.