v0.2.0

Added

• [breaking] stop reading connection config from CLICKHOUSE_* env vars
• [breaking] store migration bookkeeping in a dedicated _chum database

Other

• drop clap-parse-only tests that restate library behavior
• drop env-mutating test, remove all unsafe from the crate
• (deps) update actions/checkout action to v7
• (deps) update actions/cache action to v6