Add center alignment to images in tunnel writeup #10

	# Workflow para build do Jekyll com instalação manual do Ruby
	name: Build and Test

	on:
	push:
	branches: ["main"]
	pull_request:
	branches: ["main"]

	jobs:
	build:
	runs-on: ubuntu-22.04 # Use ubuntu-22.04 que ainda é suportado

	steps:
	- name: Checkout
	uses: actions/checkout@v4

	# Usar action oficial para setup do Ruby (mais confiável)
	- name: Setup Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: '3.1.4'
	bundler-cache: true # Automaticamente roda bundle install e faz cache

	# Build do site Jekyll
	- name: Build site
	run: bundle exec jekyll build
	env:
	JEKYLL_ENV: production

	# Opcional: Upload do artifact para debug
	- name: Upload build artifact
	uses: actions/upload-artifact@v4
	with:
	name: jekyll-build
	path: _site/

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