Add watermark support for imagen #224

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	# http://www.apache.org/licenses/LICENSE-2.0
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	name: Doc Change Check (Run "yarn docs" if this fails)

	on: pull_request

	jobs:
	doc-check:
	name: Check if reference docs have changed
	runs-on: ubuntu-latest

	steps:
	- name: Checkout Repo
	uses: actions/checkout@v3
	with:
	# get all history for the diff
	fetch-depth: 0
	- name: Set up Node (18)
	uses: actions/setup-node@v3
	with:
	node-version: 18
	- name: Yarn install
	run: yarn
	- name: Run doc generation
	run: yarn docs
	- name: Check for changes in docs-devsite dir (fail if so)
	run: git diff --exit-code docs/reference
	- name: Reference documentation needs to be updated. See message below.
	if: ${{ failure() }}
	run: echo "Changes in this PR affect the reference docs. Run \`yarn docs\` locally to regenerate docs and add them to this PR."

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