ci: Use git-security-scanner-public@2.3 with public image pull fix

ci: Use git-security-scanner-public@2.2 marketplace action

ci: Use git-security-scanner-public@v2.1 marketplace action

ci: Use git-security-scanner-public@main for latest action

ci: Fix action reference to cloudon-one/git-security-scanner-public@v3

ci: Use cloudon-one/git-security-scanner@v3 marketplace action

ci: Use direct tool installation instead of Docker for security scan

ci: Add security scanning workflow using git-security-scanner v3

Rewrite README: consolidate GCP and AWS docs

Update README with AWS/GCP configs & notes

Refactor AWS finops cleanup and update infra

Update funding sources in FUNDING.yml

Revamp README with detailed FinOps Guardian docs

Merge feature/updates into main

Merge remote-tracking branch 'origin/feature/updates'