Revert "build: Remove redundant confusing Mega Linter permissions"

[vorburger]

Reverts #28

because of #50 (comment)

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	1		0	0.6s
✅ COPYPASTE	jscpd	yes		no	1.78s
✅ EDITORCONFIG	editorconfig-checker	1		0	0.1s
✅ REPOSITORY	checkov	yes		no	11.76s
✅ REPOSITORY	gitleaks	yes		no	0.87s
✅ REPOSITORY	git_diff	yes		no	0.02s
✅ REPOSITORY	grype	yes		no	12.96s
✅ REPOSITORY	secretlint	yes		no	0.89s
✅ REPOSITORY	trivy	yes		no	4.8s
✅ REPOSITORY	trivy-sbom	yes		no	4.7s
✅ REPOSITORY	trufflehog	yes		no	4.97s
✅ YAML	prettier	1	0	0	0.49s
✅ YAML	v8r	1		0	2.07s
✅ YAML	yamllint	1		0	0.53s

See detailed report in MegaLinter reports
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

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