Install Trivy from its release, not through apt - #941
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The scanner job installed Trivy through apt, which runs `apt-get update`
across every repository on the runner image. On the v1.38.12 merge
commit the runner's preinstalled Chrome repository answered with a
corrupt index ("Hash Sum mismatch") twice in a row, and the release gate
went red on a step that has nothing to do with the image under test.
The step now fetches the pinned release binary through Trivy's own
installer, which downloads the tarball for that exact version and checks
it against the published checksums. No apt, so no unrelated repository
can fail the job.
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The Container Security job installed Trivy through apt, and
apt-get updatefailed twice in a row on the v1.38.12 merge commit because the runner's preinstalled Chrome repository answered with a corrupt index ("Hash Sum mismatch"). The step now fetches the pinned v0.74.0 release binary through Trivy's own installer, which verifies the tarball against the published checksums. No apt, so no unrelated repository can fail the gate. This PR's own Container Security run is the proof.