Update ebookmaker, CSS validator & Changelog #925

	name: perltidy
	on: [push, pull_request]
	jobs:
	perltidy:
	runs-on: ubuntu-latest
	container:
	image: perl:5.32
	steps:
	- name: Checkout code
	uses: actions/checkout@v2
	- name: perl -V
	run: perl -V
	- name: Install dependencies
	run: cpanm --quiet --installdeps --notest --with-develop .
	- name: perltidy --version
	run: perltidy --version
	- name: Run perltidy
	shell: bash
	run: ./format_files.sh --check

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