Update buildbook.yml #2

	# This workflow makes sure we can build all the books successfully
	permissions:
	contents: read
	on:
	push:
	branches: [actions]
	pull_request:
	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.run_id }}
	cancel-in-progress: true
	name: build-book
	jobs:
	buildbook:
	runs-on: ubuntu-latest
	name: ${{ matrix.target }}
	strategy:
	matrix:
	target: [thumbv8m.main-none-eabihf]
	steps:
	- uses: actions/checkout@v4
	- name: Install mdbook
	run: apt-get install mdbook

	- name: Build all books
	run:
	for book in $(find . -name book.toml -exec dirname {} \;); do
	mdbook build $book
	done

	- name: Upload built books
	uses: actions/upload-artifact@v2
	with:
	name: built-books
	path: '**/book'

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