docs: update pitr readme #574

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	# Licensed to the Apache Software Foundation (ASF) under one
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	# to you under the Apache License, Version 2.0 (the
	# "License"); you may not use this file except in compliance
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	# http://www.apache.org/licenses/LICENSE-2.0
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	name: lint-commit-message
	on: [pull_request]

	jobs:
	commit-msg:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	with:
	fetch-depth: 0
	- name: Cache lint-commit-message
	id: cache-lint-commit-message
	uses: actions/cache@v3
	with:
	path: lint-commit-message
	key: ${{ runner.os }}-lint-commit-message
	- name: Lint commit message
	run: \|
	! git log --oneline ${{ github.event.pull_request.base.sha }}... \
	\| grep -vP '^\w{7} Merge ' \
	\| grep -vP '^\w{7} (feat\|fix\|docs\|style\|refactor\|perf\|revert\|test\|chore)($.+$)?:.{1,68}$'

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