Build script does not run when using gatsby-cli 1.12 version

[seonim-ryu]

Describe the bug

If @toast-ui/doc run the build script, an error occurs and it does not build. As the gatsby-cli version is updated to 1.12, the flag value of the build script is strictly checked and not built.

To Reproduce

Steps to reproduce the behavior:

1. Run the script.

$ npm run tuidoc

Expected behavior

The build script should run. To do this, it is necessary to be able to handle the flag value that is passed when executing gatsby build script.

• AS-IS

$ gatsby build --prefix-paths latest

• TO-BE

$ GATSBY_ACTIVE_ENV=latest gatsby build --prefix-paths
$ GATSBY_ACTIVE_ENV=semver gatsby build --prefix-paths

Screenshots

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context

Add any other context about the problem here.