Mastra wasn't able to build your project

> @acme/worker@ build /Users/amosbastian/Development/mastra-reproduction/apps/worker
> mastra build

INFO [2025-11-05 20:37:07.683 +0100] (Mastra CLI): Analyzing dependencies...
INFO [2025-11-05 20:37:08.601 +0100] (Mastra CLI): Optimizing dependencies...
TypeError [ERR_INVALID_URL_SCHEME]: The URL must be of scheme file
  ... {
  code: 'ERR_INVALID_URL_SCHEME'
}
ERROR [2025-11-05 20:37:10.979 +0100] (Mastra CLI): Mastra wasn't able to build your project. Please add `@acme/worker-core` to your externals.

export const mastra = new Mastra({
  bundler: {
    externals: ["@acme/worker-core"],
  }
})
    domain: "DEPLOYER"
    category: "USER"
    details: {
      "importFile": "/Users/amosbastian/Development/mastra-reproduction/packages/worker-core/dist/workflow/my-workflow.js",
      "packageName": "@acme/worker-core"
    }
 ELIFECYCLE  Command failed with exit code 1.