Switch to megalinter

[unixorn]

Description

• Switch to megalinter.
• Upload megalinter results as GitHub artifacts

Checklist

• All new and existing tests pass.
• Any added/updated scripts added use #!/usr/bin/env interpreter instead of potentially platform-specific direct paths (#!/bin/sh and #!/bin/bash are allowed exceptions)
• Added/updated scripts are marked executable
• Scripts do not have a language file extension unless they are meant to be sourced and not run standalone. No end-user should have to know if a script was written in bash, python, ruby or whatever. Not including file extensions makes it easier to rewrite the script in another language later without having to change every reference to the previous version.
• I have confirmed that the link(s) in my PR are valid.

License Acceptance

• This repository is Apache version 2.0 licensed (some scripts may have alternate licensing inline in their code) and by making this PR, I am contributing my changes to the repository under the terms of the Apache 2 license.

[github-actions]

Mega-Linter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	1		0	0.02s
✅ COPYPASTE	jscpd	yes		no	1.17s
✅ CREDENTIALS	secretlint	yes		no	0.93s
✅ GIT	git_diff	yes		no	0.01s
✅ MARKDOWN	markdownlint	1		0	0.35s
✅ MARKDOWN	markdown-link-check	1		0	1.54s
✅ MARKDOWN	markdown-table-formatter	1		0	0.3s
❌ SPELL	cspell	2		15	1.78s
✅ SPELL	misspell	2		0	0.04s
✅ YAML	prettier	1		0	1.41s
✅ YAML	v8r	1		0	1.95s
✅ YAML	yamllint	1		0	0.15s

See errors details in artifact Mega-Linter reports on GitHub Action page
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff