Automate the dev environment with Devbox (#1169)
* chore: git-ignore openstatus-dev.db
* chore: make the db seed script idempotent
* chore: configure Devbox
This requires https://github.com/jetpack-io/devbox to be installed. Then
all that is needed is to run "devbox services up" in the project root.
* chore: Remove unnecessary commands in Devbox setup
* chore: add a workaround to tell corepack to download pnpm
This is needed because corepack prompts the user before downloading
pnpm.
* docs: Document how to get started with Devbox