[MISC] Add shellcheck checks to ensure that those few shell scripts we have are "robust" #2

	---
	name: Shellcheck

	on:
	push:
	branches: [master]
	pull_request:
	branches: [master]

	permissions:
	contents: read

	jobs:
	shellcheck:
	name: Check shell scripts
	runs-on: ubuntu-latest

	steps:
	- name: Checkout
	uses: actions/checkout@v4
	- name: Install dependencies
	run: \|
	sudo apt update && sudo apt install -y shellcheck
	- name: shellcheck
	run: \|
	git grep -l '^#\( *shellcheck \\|!\(/bin/\\|/usr/bin/env \)\(sh\\|bash\\|dash\\|ksh\)\)' \| xargs shellcheck

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