Updated migration steps #6012

	name: Build PMM Docs 3.x

	on:
	push:
	branches:
	- main
	pull_request:

	workflow_dispatch:

	jobs:
	build:
	runs-on: ubuntu-latest

	steps:
	- name: Check out code
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Setup Python
	uses: actions/setup-python@v4
	with:
	python-version: '3.x'
	cache: 'pip'

	- name: Setup MkDocs
	run: \|
	python -m pip install --upgrade pip
	pip install wheel
	test -f requirements.txt && pip install -r requirements.txt

	- name: Configure git
	env:
	ROBOT_TOKEN: ${{ secrets.ROBOT_TOKEN }}
	run: \|
	git config --global url."https://percona-platform-robot:${ROBOT_TOKEN}@github.com".insteadOf "https://github.com"
	git config user.name "GitHub Action"
	git config user.email "github-action@users.noreply.github.com"
	git config user.password "${ROBOT_TOKEN}"
	echo "GIT_USER=percona-platform-robot:${ROBOT_TOKEN}" >> $GITHUB_ENV

	# Builds Material-themed static web site in 'preview' branch
	- name: Build a themed site (2.x)
	run: \|
	PATH=$PATH:_resources/bin mike deploy 3.x -b preview
	mike set-default 3.x -b preview
	mike retitle 3.x "PMM 3.x (LATEST)" -b preview

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