create database migration service (container)

[josefaidt]

Describe the Feature

As the bot and frontend are split into separate apps, it makes sense to extract the database init and migrations into their own service. This service should:

• start with project deployment
• run prisma seed (if necessary, this will create the initial dataset such as ACCESS_LEVELS, etc.)
• run prisma migrations
• stop and shutdown

Note: we will need to ensure the bot and frontend services are not impacted by the migrations or seeds run by the (somewhat ephemeral) database service