Add SBOM and SBOM generator scripts

[simonklb]

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• [kind/adr](set-me)

What does this PR do / why do we need this PR?

• Fixes https://github.com/elastisys/ck8s-issue-tracker/issues/549

Information to reviewers

See: https://github.com/elastisys/sbom-generator/pull/16

Checklist

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• Change checks:
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  • The change requires migration steps
• Documentation checks:
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  • The public documentation required an update - [link to change](set-me)
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  • The metrics names did change (Grafana dashboards and Prometheus alerts required an update)
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  • The bug fix is covered by regression tests