Add actions permission monitor to CI #2080

	name: whitespace
	on:
	pull_request:
	branches: [ main ]
	permissions:
	contents: read
	jobs:
	whitespace:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: check
	run: \|
	git remote add upstream https://github.com/$GITHUB_REPOSITORY
	git fetch upstream
	git diff --check upstream/main

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