If you’re using the build script to install dependencies, you may not need these to be downloaded from their source during each deployment.
If they are being downloaded during every build, you may find that deployments containing a build script are taking a long time to deploy. To help with this, you could keep one or more directories that contain these dependencies in your project repository to shorten the build time in future deployments.
Though, We have a planned feature of exclude files to be released in the coming months.