Sync from Upstream LLVM #816

	# This workflow fetches changes from relevant branches from the
	# llvm/llvm-project repository (upstream) into the corresponding branches
	# in the arm/arm-toolchain repository (downstream), keeping them in sync.
	name: Sync from Upstream LLVM
	on:
	schedule:
	- cron: '0,30 * * * *'
	workflow_dispatch:
	jobs:
	Fetch-Upstream:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	branch: [main, release/19.x]
	env:
	UPSTREAM_REMOTE: https://github.com/llvm/llvm-project.git
	steps:
	- name: Configure Access Token
	uses: actions/create-github-app-token@v1
	id: generate-token
	with:
	app-id: ${{ secrets.SYNC_APP_ID }}
	private-key: ${{ secrets.SYNC_APP_PRIVATE_KEY }}
	- name: Checkout
	uses: actions/checkout@v4
	with:
	ref: ${{ matrix.branch }}
	token: ${{ steps.generate-token.outputs.token }}
	- name: Configure Upstream Remote
	run: git remote add upstream ${{ env.UPSTREAM_REMOTE }}
	- name: Fetch Upstream Changes
	run: git pull --ff-only upstream ${{ matrix.branch }}
	- name: Configure Git Identity
	run: \|
	git config --local user.name "github-actions[bot]"
	git config --local user.email "41898282+github-actions[bot]@users.noreply.github.com"
	- name: Push Changes
	run: git push origin ${{ matrix.branch }}

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