[Feat]支持 Sender 组件 content 自定义渲染，以支持类似的 speech 交互变体需求或者支持其他的content自定义渲染需求 #951

	# When `preview-build` start. Leave a message on the PR
	#
	# 🚨🚨🚨 Important 🚨🚨🚨
	# Never do any `checkout` or `npm install` action!
	# `pull_request_target` will enable PR to access the secrets!

	name: Preview Start

	on:
	pull_request_target:
	types: [opened, synchronize, reopened]

	permissions:
	contents: read

	jobs:
	preview-start:
	permissions:
	issues: write # for actions-cool/maintain-one-comment to modify or create issue comments
	pull-requests: write # for actions-cool/maintain-one-comment to modify or create PR comments
	name: start preview info
	runs-on: ubuntu-latest
	steps:
	- name: update status comment
	uses: actions-cool/maintain-one-comment@v3
	with:
	token: ${{ secrets.GITHUB_TOKEN }}
	body: \|
	[<img width="500" alt="Prepare preview" src="https://user-images.githubusercontent.com/5378891/72351368-2c979e00-371b-11ea-9652-eb4e825d745e.gif">](https://preview-${{ github.event.number }}-ant-design.surge.sh)
	<!-- AUTO_PREVIEW_HOOK -->
	body-include: '<!-- AUTO_PREVIEW_HOOK -->'

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