cherry-pick tc2-agent update #412

	# Checkout all three branches, aggregate version info, and commit changes
	# to each branch if any of the version information in any branch has changed.

	name: aggregate-version-info
	on: [push, workflow_dispatch]
	env:
	HAS_CHANGES: ${{ false }}
	jobs:
	aggregate-version-info:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	with:
	path: dev
	ref: dev
	- name: Checkout
	uses: actions/checkout@v4
	with:
	path: prod
	ref: prod
	- name: Checkout
	uses: actions/checkout@v4
	with:
	path: test
	ref: test
	- name: Checkout
	uses: actions/checkout@v4
	with:
	repository: TheCacophonyProject/salt-version-info
	path: salt-version-info
	token: ${{ secrets.WRITE_VERSION_INFO_TOKEN }}
	persist-credentials: true
	- uses: actions/[email protected]
	with:
	node-version: 20.x
	- name: Run version-check script
	shell: bash
	run: \|
	cd dev/.github/workflows
	npm i
	npm run aggregate-versions ${{ github.repository }}
	- name: Check for new files
	id: newFiles
	shell: bash
	working-directory: salt-version-info
	run: \|
	git add -A
	git status --porcelain \| wc -l
	if [[ $(git status --porcelain \| wc -l) -gt 0 ]]; then
	echo "HAS_CHANGES=true" >> "$GITHUB_ENV"
	else
	echo "HAS_CHANGES=false" >> "$GITHUB_ENV"
	fi
	- name: Push new files
	if: env.HAS_CHANGES == 'true'
	shell: bash
	working-directory: salt-version-info
	run: \|
	git config --global user.name "cacophony-bot"
	git config --global user.email "[email protected]"
	git commit -m "updated version information"
	git push

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