Add Puma configuration

[mitchellhenke]

🛠 Summary of changes

We use puma in local development and review applications, but do not include a configuration for it. This change adds a slightly modified version of the puma config that Rails generates in new applications.

[aduth]

the puma config that Rails generates in new applications

Ref: https://github.com/rails/rails/blob/main/railties/lib/rails/generators/rails/app/templates/config/puma.rb.tt

[aduth]

I can confirm that this does seem to alleviate the hanging requests 👍

I'm a little concerned that multithreaded isn't working though, if it implies some incompatibility of our code or other dependencies. I found a similar StackOverflow question which is almost identical to our scenario, including the lock debug result, but there doesn't seem to be an answer there. Maybe it's a Puma issue? In any case, the DebugLocks middleware was new to me and could be useful.

[mitchellhenke]

I can confirm that this does seem to alleviate the hanging requests 👍

I'm a little concerned that multithreaded isn't working though, if it implies some incompatibility of our code or other dependencies. I found a similar StackOverflow question which is almost identical to our scenario, including the lock debug result, but there doesn't seem to be an answer there. Maybe it's a Puma issue? In any case, the DebugLocks middleware was new to me and could be useful.

Yep, there is work to do on multi-threading. It appears to be something with reloading.