`pachy.toml` loader with environment variable overrides for Pachycephalosaurus.
```toml
host = "127.0.0.1"
port = 3000
log_level = "info" # error|warn|info|debug|trace
debug_mode = false
watch_dirs = ["src", "Cargo.toml"]
build_target = "wasm32-unknown-unknown"
deploy_target = "native" # native|serverless|docker
shutdown_timeout_secs = 30