Add R2DevOps way to setup MegaLinter on Gitlab

[nvuillam]

Fixes #3065

[github-actions]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ BASH	bash-exec	5		0	0.01s
✅ BASH	shellcheck	5		0	0.11s
✅ BASH	shfmt	5	0	0	0.23s
✅ COPYPASTE	jscpd	yes		no	4.27s
✅ DOCKERFILE	hadolint	124		0	14.32s
✅ JSON	eslint-plugin-jsonc	23	0	0	3.71s
✅ JSON	jsonlint	21		0	0.26s
✅ JSON	v8r	23		0	18.35s
✅ MAKEFILE	checkmake	1		0	0.0s
⚠️ MARKDOWN	markdownlint	256	0	11	6.75s
✅ MARKDOWN	markdown-link-check	256		0	7.95s
✅ MARKDOWN	markdown-table-formatter	256	0	0	51.15s
✅ OPENAPI	spectral	1		0	1.8s
⚠️ PYTHON	bandit	201		61	6.4s
✅ PYTHON	black	201	0	0	4.08s
✅ PYTHON	flake8	201		0	3.06s
✅ PYTHON	isort	201	0	0	0.85s
✅ PYTHON	mypy	201		0	14.41s
✅ PYTHON	pylint	201		0	16.3s
⚠️ PYTHON	pyright	201		342	24.11s
✅ PYTHON	ruff	201	0	0	0.46s
✅ REPOSITORY	checkov	yes		no	36.3s
✅ REPOSITORY	git_diff	yes		no	0.24s
⚠️ REPOSITORY	grype	yes		1	23.63s
✅ REPOSITORY	secretlint	yes		no	10.77s
✅ REPOSITORY	trivy	yes		no	40.44s
✅ REPOSITORY	trivy-sbom	yes		no	21.25s
⚠️ REPOSITORY	trufflehog	yes		1	18.43s
✅ SPELL	cspell	668		0	30.74s
❌ SPELL	lychee	336		3	3.53s
✅ XML	xmllint	3	0	0	0.24s
✅ YAML	prettier	160	0	0	7.96s
✅ YAML	v8r	102		0	150.38s
✅ YAML	yamllint	161		0	2.15s

See detailed report in MegaLinter reports

MegaLinter is graciously provided by