Add notice for buf-action #27

	name: Draft Release
	on:
	pull_request:
	types: [closed]
	workflow_dispatch:
	inputs:
	version:
	type: string
	description: The released CLI version without 'v'. For example, 1.0.0.
	permissions:
	contents: write
	env:
	APP_ID: 257262
	jobs:
	draft_release:
	runs-on: ubuntu-latest
	if: ${{ github.event_name == 'workflow_dispatch' \|\| (github.event_name == 'pull_request' && github.event.pull_request.merged == true && startsWith(github.event.pull_request.head.ref, 'release')) }}
	steps:
	- name: Validate input version
	if: ${{ startsWith(github.event.inputs.version, 'v') }}
	run: \|
	echo "error: version must not start with 'v'."
	exit 1
	- name: Set VERSION variable
	# The head ref looks like release/v1.0.0, and we need to trim the string up to the `/v`.
	run: \|
	VERSION="${{ github.event.inputs.version \|\| github.head_ref}}"
	echo "VERSION=${VERSION##*/v}" >> $GITHUB_ENV
	- name: Get GitHub app token
	uses: actions/create-github-app-token@v1
	id: app_token
	with:
	app-id: ${{ env.APP_ID }}
	private-key: ${{ secrets.TOKEN_EXCHANGE_GH_APP_PRIVATE_KEY }}
	- name: Checkout repository code
	uses: actions/checkout@v3
	with:
	token: ${{ steps.app_token.outputs.token }}
	fetch-depth: 0
	- name: Sync v1 branch
	run: \|
	git fetch origin
	git switch v1
	git merge origin/main
	git push origin v1
	- name: Release
	run: gh release create --draft --title "v${VERSION}" "v${VERSION}"
	env:
	GH_TOKEN: ${{ steps.app_token.outputs.token }}

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