Add upstream check #3

	name: Check for new upstream font data
	on:
	pull_request:
	branches: [main]
	push:
	branches: [main]
	schedule:
	- cron: '0 0 * * 0'
	jobs:
	check_upstream_changes:
	name: Check upstream changes
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	with:
	submodules: true

	- name: Check if upstream changed the font file
	run: \|
	set -eu
	cd u8g2
	git fetch
	git diff origin/master HEAD -- csrc/u8g2_fonts.c

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