chore: update thumbs script #3

	name: Generate Thumbnails

	on:
	pull_request:
	branches:
	- main

	jobs:
	generate-thumbnails:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout repository
	uses: actions/checkout@v2

	- name: Set up GraphicsMagick
	run: sudo apt-get update && sudo apt-get install -y graphicsmagick

	- name: Run thumbnail generation script
	run: \|
	cd posts
	make thumbs

	- name: Commit and push changes
	run: \|
	git config --global user.name 'github-actions'
	git config --global user.email 'github-actions@github.com'
	git add .
	git commit -m "Auto-generate thumbnails"
	git push
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

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