Confirm this can be deployed to the Heroku-20 stack

[aaronpk]

We need to upgrade this to the Heroku-20 stack, which has a different list of supported Ruby versions than the Heroku-16 stack.

https://devcenter.heroku.com/articles/heroku-20-stack

If anyone wants to try getting this running in a recent version of Ruby that would be much appreciated!

[jalcine]

Is this still a point of concern today? I mentioned something else in chat, but updating it to the now H22 stack might be worth looking into as part of such a bump.

(Originally published at: https://jacky.wtf/2022/7/Gnpb)

[jgarber623]

@aaronpk Following up on the discussion in #microformats from earlier this week:

Can you document (here or elsewhere) the current stack that this app is deployed on?

Thinking:

• Heroku details
• Ruby version
• PostgreSQL version

Some of those details may be covered by "Heroku details" but I haven't used that service in a minute, so I forget how they roll out support for things like Ruby, Node.js, etc.

Knowing these details would inform the work in #84.