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.

[vercel]

@Brendonovich is attempting to deploy a commit to the Cap Software Inc Team on Vercel.

A member of the Team first needs to authorize it.

[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.