☂️ make everything just be docker containers 🐳

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Maintaining all these services as a big bundle of system-wide mutable state kinda sucks and we demonstrably do not have the people-power to do it. Shoving everything into containers would allow us to at least turn a system operations (which we suck at) problem largely into a software development problem (which we might be able to manage).

(I really thought there was a ticket about this open since forever, but I couldn't find it, so please feel free to dup it if I missed something obvious.)

Sub-tasks:

• containerize mailman #266 (mailman; mailing lists)
• containerize t-web #267 (t-web; frontend web server)
• containerize trac #268 (trac and probably also amptrac; issue tracker and wiki)
• containerize kenaan (i.e. commit_bot) #269 (kenaan; commit-bot)
• containerize t-names #270 (t-names; dns primary) ⭐ start with this one probably
• containerize highscores #271 (private highscores page at https://twistedmatrix.com/highscores/ )

These can all be coordinated in one big docker-compose file to run in production and we can delete just about all of the fabric stuff we currently have.

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Now that we're not responsible for hosting mailman, containerizing the rest of these things should be much more straightforward. For Trac / kenaan email access, we can drop the exim4 credentials into the same spot in the filesystem for talking to mailgun where they're currently present, we just have to make sure that the exim qrunner (or whatever) is running in each container so it will deliver messages enqueued with sendmail.