appendix: add security section for future advisories

[berendt]

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[github-actions]

❌MegaLinter analysis: Error

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	3		0	0	0.03s
✅ JSON	jsonlint	4		0	0	0.16s
✅ JSON	prettier	4		0	0	0.52s
✅ JSON	v8r	4		0	0	6.61s
✅ MARKDOWN	markdownlint	158		0	0	2.0s
✅ MARKDOWN	markdown-table-formatter	158		0	0	0.3s
✅ REPOSITORY	checkov	yes		no	no	16.87s
✅ REPOSITORY	git_diff	yes		no	no	0.04s
✅ REPOSITORY	secretlint	yes		no	no	1.83s
✅ REPOSITORY	trufflehog	yes		no	no	3.86s
✅ SPELL	cspell	188		0	0	6.2s
❌ SPELL	lychee	175		1	0	5.75s
✅ YAML	prettier	5		0	0	0.38s
✅ YAML	v8r	5		0	0	6.76s
✅ YAML	yamllint	5		0	0	0.42s

Detailed Issues

❌ SPELL / lychee - 1 error

[ERROR] https://www.openstack.org/software/project-navigator/openstack-components#openstack-services | Network error: error sending request for url (https://www.openstack.org/software/project-navigator/openstack-components#openstack-services) Maybe a certificate error?
📝 Summary
---------------------
🔍 Total..........765
✅ Successful.....713
⏳ Timeouts.........0
🔀 Redirected.......0
👻 Excluded........51
❓ Unknown..........0
🚫 Errors...........1

Errors in docs/guides/deploy-guide/services/openstack.md
[ERROR] https://www.openstack.org/software/project-navigator/openstack-components#openstack-services | Network error: error sending request for url (https://www.openstack.org/software/project-navigator/openstack-components#openstack-services) Maybe a certificate error?

See detailed reports in MegaLinter artifacts

Your project could benefit from a custom flavor, which would allow you to run only the linters you need, and thus improve runtime performances. (Skip this info by defining FLAVOR_SUGGESTIONS: false)

• Documentation: Custom Flavors
• Command: npx mega-linter-runner@9.3.0 --custom-flavor-setup --custom-flavor-linters ACTION_ACTIONLINT,JSON_JSONLINT,JSON_V8R,JSON_PRETTIER,MARKDOWN_MARKDOWNLINT,MARKDOWN_MARKDOWN_TABLE_FORMATTER,REPOSITORY_CHECKOV,REPOSITORY_GIT_DIFF,REPOSITORY_SECRETLINT,REPOSITORY_TRUFFLEHOG,SPELL_CSPELL,SPELL_LYCHEE,YAML_PRETTIER,YAML_YAMLLINT,YAML_V8R