Add (re)generating section

Ash McKenzierequested to merge
ashmckenzie-main-patch-7b18 into main

Overview

This small MR adds how to (re)generate SBOMs manually, which was necessary as part of https://gitlab.com/gitlab-com/gl-security/product-security/product-security-engineering/product-security-engineering-team/-/issues/250+.

Edited by Ash McKenzie

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