Use `@mattrax/mysql-planetscale` in dev

[Brendonovich]

Implements the @mattrax/mysql-planetscale library in development to allow @planetscale/database to connect with a plain mysql database. The way i've implemented this requires moving from the DB_* environment variables to a single DATABASE_URL connection string. The url needs to start mysql:// during development and when using drizzle kit, and should start with https:// in production or when testing locally using planetscale.

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[richiemcilroy]

Thanks for this @Brendonovich! much appreciated. Also added in a new docker-compose.yml file, and updated the dev to include the creation of the DB + migration etc.