.github: Several CI-related improvements#4105

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Commits on Jun 19, 2026

.github: Push ca-certificates and Mantle bumps without creating a PR
chewi
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.github: Check out workflow branch for ca-certs and kernel bump jobs
chewi
committed
.github: Automatically post image changes reports to pull requests
chewi
committed
.github: Allow flatcar-infra to run CI without approval
chewi
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.github: Make approval gate explicit so it is less visually confusing
chewi
committed
.github: Build with Jenkins instead of GHA when jenkins-ci label present
chewi
committed