serverless/docs/providers/google/guide/packaging.md

Read this on the main serverless docs site

Google - Packaging

Package CLI Command

Using the Serverless CLI tool, you can package your project without deploying it to the Google Cloud. This is best used with CI / CD workflows to ensure consistent deployable artifacts.

Running the following command will build and save all of the deployment artifacts in the service's .serverless directory:

serverless package

However, you can also use the --package option to add a destination path and Serverless will store your deployment artifacts there (./my-artifacts in the following case):

serverless package --package my-artifacts