feat(confidentialcomputing): Mark all fields Optional for ContainerImageSignagure proto#8380
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gcf-merge-on-green[bot] merged 2 commits intomainfrom owl-bot-copyAug 4, 2023
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Optional for ContainerImageSignagure proto#8380![gcf-owl-bot[bot]](https://avatars.githubusercontent.com/in/99011?v=4&size=32){kind=avatar}