feat: Adds flyway database migrations to board server

[wfaithfull]

Fixes #2947

Adds support for database migrations in SQLite mode using flyway.

• Breaks migrations out into src/migrations
• Migrations are straightforward SQL files, when we need to make a change, we can write a new SQL file to migrate existing databases to a new schema.
• We can also write rollback files to roll database versions backwards.
• Flyway maintains an internal state table in SQLite to track the database version.
• Migrations are baked into the container image, and will be automatically applied when rolling out a container with migrations that aren't included in the local DB.
• Includes a script to initialise and migrate the database at local development time in package.json

[changeset-bot]

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[wfaithfull]

@TinaNikou could you try and run the docker build on this for me 😄

[wfaithfull]

@dglazkov or @timswanson-google would you mind having a look at this?

[dglazkov]

LGTM!