add note re: ssh clone for dt codelab #3

	name: Update Codelabs Site Repo
	on:
	push:
	branches: [ master ]

	jobs:
	Checkout_Site_Repo:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout site repo
	uses: actions/checkout@v2
	with:
	repository: SolaceDev/solace-dev-codelabs-site
	submodules: recursive
	token: ${{ secrets.GITHUB_TOKEN }}
	- name: Install SSH key
	uses: shimataro/ssh-key-action@v2
	with:
	key: ${{ secrets.SSH_KEY }}
	known_hosts: ${{ secrets.KNOWN_HOSTS }}
	- name: Update submodule
	run: \|
	git submodule update --remote
	git config user.name github-actions
	git config user.email github-actions@github.com
	git add .
	git commit -m "update submodule from github actions"
	git remote add upstream git@github.com:SolaceDev/solace-dev-codelabs-site.git
	git push upstream master

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