* Improve GitHub workflows for improved security

- Remove SECURITY.md file and link to the global security policy
- Update dependabot configuration for better scheduling and grouping
- Enhance Docker workflows with updated actions and improved SBOM handling
- Add Supply Chain Security documentation outlining release pipeline and verification processes
- Correct minor typos in the roadmap and README files

* Adds missing workflow triggers

* Further improves workflows

* Adresses review remarks