build: Standardize asset containers to use official Ubuntu base images.#3

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PacificViking wants to merge 4 commits intoy-scope:mainfrom

PacificViking:john_ubuntu_jammy_rename

Commits on Jul 28, 2025

change ubuntu references to ubuntu:jammy
PacificViking
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Commits on Jul 30, 2025

fix according to coderabbit recommendations
PacificViking
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lock gzip version (this was the reason for --allow-downgrades, it was accidentially not included in the original commit)
PacificViking
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Commits on Aug 9, 2025

lock gzip version
PacificViking
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