@onlyIfNotExists example

[riosengineer]

• Adds @onlyIfNotExists example for key vault secrets

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ BICEP	bicep_linter	1		0	0	4.89s
✅ MARKDOWN	markdownlint	1		0	0	0.66s
✅ MARKDOWN	markdown-table-formatter	1		0	0	0.25s
✅ REPOSITORY	devskim	yes		no	no	1.64s
✅ REPOSITORY	dustilock	yes		no	no	0.02s
✅ REPOSITORY	git_diff	yes		no	no	0.01s
✅ REPOSITORY	secretlint	yes		no	no	1.28s
✅ REPOSITORY	syft	yes		no	no	1.92s
✅ REPOSITORY	trivy-sbom	yes		no	no	0.39s
✅ REPOSITORY	trufflehog	yes		no	no	4.06s

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