tikv: add the user's guide of stale read and safe ts (#15365) (#15410) #400

	name: Upload media files to Qiniu when they change
	on:
	push:
	branches:
	- master
	- release-*
	paths:
	- media/**
	jobs:
	run:
	name: Upload media files
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	with:
	# Must use at least depth 2!
	fetch-depth: 2

	- name: Download cloud_assets_utils
	run: \|
	curl -L https://github.com/pingcap/cloud-assets-utils/releases/download/v0.2.0/cloud_assets_utils-ubuntu-latest -o cloud_assets_utils
	chmod +x cloud_assets_utils
	sudo mv cloud_assets_utils /usr/local/bin/cloud-assets-utils
	- name: Configure qshell
	run: \|
	curl http://devtools.qiniu.com/qshell-linux-x64-v2.4.1.zip -o qshell.zip
	unzip qshell.zip
	sudo mv qshell-linux-x64-v2.4.1 /usr/local/bin/qshell
	qshell account ${{ secrets.QINIU_ACCESS_KEY }} ${{ secrets.QINIU_SECRET_KEY }} test
	#- name: Configure awscli
	# run: \|
	# pip3 install --upgrade setuptools
	# pip3 install awscli
	# printf "%s\n" ${{ secrets.AWS_ACCESS_KEY }} ${{ secrets.AWS_SECRET_KEY }} ${{ secrets.AWS_REGION }} "json" \| aws configure
	- name: Upload
	run: cloud-assets-utils verify-and-sync -qiniu true -qiniu-bucket ${{ secrets.QINIU_BUCKET_NAME }} media -replace-first-path-to images/docs-cn -cdn-refresh https://download.pingcap.com/

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