Right now I'm just working within sqlite, but the migrations will need to be
mirrored for PostgreSQL in the future in `migrations/postgres`
Running this entails using the sqlx-cli (`cargo install sqlx-cli`)
% sqlx migrate --source migrations/sqlite run
Including an example to help tinker with the user interface for modeling a
process for a mock heroku-based web application.
What's missing right now for sure is the concept of credentials and how those
might fit into the world. That will require more thought.
The syntax is at the moment heavily inspired by Declarative Pipeline from
Jenkins, but not actually compatible.