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Modernize bash scripts, make them pass shellcheck, use shellcheck --e… #1

	# ----------------------------------------------------------------------------
	# GitHub Actions workflow to check shell scripts for errors.
	# ----------------------------------------------------------------------------

	name: ShellCheck

	on: [push, pull_request]

	defaults:
	run:
	shell: bash

	jobs:
	shellcheck:
	name: ShellCheck
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v6
	- name: Run ShellCheck
	run: ./shellcheck_here