Running pre-build commands

In order to have Gatsby run a command before building a site in Gatsby Cloud, you'd need to include your script in one of the Gatsby node APIs in gatsby-node.js.

Most likely, you will want to use either onPreBootstrap or onPreBuild as documented here:

• onPreBootstrap
• onPreBuild

You can also learn more about the entire Gatsby build process here: What happens when you run gatsby build?