build-update-repo: Add --no-update-[summary,appstream]

We'd like to use these in flat-manager for more detailed updates
of the repo.

Closes: #2730
Approved by: alexlarsson
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f