Nixpacks Configuration File (nixpacks.toml)
Projects can override or extend the auto-detected build plan by committing a `nixpacks.toml` (or `nixpacks.json`) file at the root of the repository. The configuration file mirrors the build-plan structure with top-level `providers`, `buildImage`, `variables`, and `staticAssets`, a `[phases.]` table for each phase carrying `cmds`, `nixPkgs`, `nixLibs`, `aptPkgs`, `dependsOn`, `cacheDirectories`, `onlyIncludeFiles`, and `paths`, and a `[start]` table for `cmd`, `runImage`, and runtime-only file inclusion. The `"..."` token can be used inside array fields to extend rather than replace provider-supplied values.