addon-template
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update gems and ruby version, and fix a few related things
Not sure if this is still the recommended way of making heroku addon, however, I found a few things require fixing to at least get the server up and running with the latest Pliny gem. Changes made
- Ruby version to 2.7.0
- Pliny to 0.28
- Sequel to 5.37
- Sinatra to 2.1.0 (and a few more gems)
Also made pliny_env to app_env which is required for the server to boot-up