Actix 4 with SeaORM example app

1. Modify the DATABASE_URL var in .env to point to your chosen database

2. Turn on the appropriate database feature for your chosen db in service/Cargo.toml (the "sqlx-mysql", line)

3. Execute cargo run to start the server

4. Visit localhost:8000 in browser

Run server with auto-reloading:

cargo install systemfd cargo-watch
systemfd --no-pid -s http::8000 -- cargo watch -x run

Run mock test on the service logic crate:

cd service
cargo test --features mock