add(book): Describes custom Testnets in the Zebra book #1269

	# Workflow patches for skipping Google Cloud docs updates on PRs from external repositories.
	name: Docs

	# Run on PRs from external repositories, let them pass, and then Mergify will check them.
	# GitHub doesn't support filtering workflows by source branch names, so we have to do it for each
	# job.
	on:
	pull_request:

	# IMPORTANT
	#
	# The job names in `docs-deploy-firebase.yml`, `docs-deploy-firebase.patch.yml` and
	# `docs-deploy-firebase.patch-external.yml` must be kept in sync.
	jobs:
	build-docs-book:
	name: Build and Deploy Zebra Book Docs
	# Only run on PRs from external repositories.
	if: ${{ startsWith(github.event_name, 'pull') && github.event.pull_request.head.repo.fork }}
	runs-on: ubuntu-latest
	steps:
	- run: 'echo "Skipping job on fork"'

	build-docs-internal:
	name: Build and Deploy Zebra Internal Docs
	# This dependency allows all these jobs to depend on a single condition, making it easier to
	# change.
	needs: build-docs-book
	runs-on: ubuntu-latest
	steps:
	- run: 'echo "Skipping job on fork"'

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