Check out head_ref of source branch on PRs #21

	name: pull_request

	on:
	pull_request:

	env:
	REGISTRY: ghcr.io
	IMAGE_NAME: ${{ github.repository }}

	jobs:
	# Build a fresh container for the PR.
	build-container:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write

	steps:
	# Login against a Docker registry
	# https://github.com/docker/login-action
	- name: Log into registry
	uses: docker/login-action@v3
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Setup Docker buildx
	uses: docker/setup-buildx-action@v3

	# Build and push Docker image as "pandoc_test"
	# Only amd64, since we're just building a container
	# to be used below in the GH action runner.
	- name: Build and publish Docker image
	uses: docker/build-push-action@v5
	with:
	# Cache layers from the container repo.
	# This minimizes the amount of times we have to rebuild pandoc.
	# Read-only: Avoid cluttering up the cache on pull requests.
	cache-from: type=gha
	platforms: linux/amd64
	push: true
	tags: ghcr.io/trustedcomputinggroup/pandoc_test

	# Use the fresh container to render the samples.
	render-samples:
	needs: build-container
	uses: ./.github/workflows/render.yml
	with:
	container: ghcr.io/trustedcomputinggroup/pandoc_test
	container-version: latest
	input: guide.tcg
	workflow: pr

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