Add codespell support (config, workflow to detect/not fix) and make it fix few typos #586

	# Copyright (C) 2022 Sebastian Pipping <sebastian@pipping.org>
	# Licensed under GPL v3 or later

	name: Enforce that copies of --help output are in sync

	on:
	- pull_request
	- push

	jobs:
	run_pre_commit:
	name: Check if copies of --help output are in sync
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1

	- name: Set up Python 3.14
	uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
	with:
	python-version: 3.14

	- name: Install build dependencies
	run: \|
	sudo apt-get install --no-install-recommends -y help2man

	- name: Install delete-merged-branches entry point script
	run: \|-
	pip install \
	--disable-pip-version-check \
	--user \
	--no-warn-script-location \
	.
	echo "PATH=${HOME}/.local/bin:${PATH}" >> "${GITHUB_ENV}"

	- name: Check if the man page is in sync with --help output
	run: \|-
	rm git-{delete-merged-branches,dmb}.1 # to enforce a diff for the generator to remove
	./sync-manpages-with-help-output.sh
	git diff --exit-code -- git-{delete-merged-branches,dmb}.1

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