The CIS gate, the SBOM, the cosign signature and the matcher's verdict lived
in NetOrk/base-os, the head of the chain. Every link below it -- base-python,
engine, ui, satellite, the service images -- needs the same, so the tools
move here, and every image repository pins them by commit.
- image_tools: cis.py, cis_os.sh, sbom.py and verify.py from base-os. The
image's own repository holds its cis.toml and packages.allow; both default
to the working directory.
- bin/sign.sh signs whatever platforms a reference holds: base-os's index of
amd64 and arm64 (EXPECT_PLATFORMS) or a dev image's single manifest
(image_tools/platforms.py).
- bin/verify-base.sh checks every FROM image of a Dockerfile against
cosign.pub before a build; one without a digest is refused
(image_tools/dockerfile.py).
- bin/install-cosign.sh installs cosign v3.1.3 for amd64 and arm64 runners,
checked against the release checksums.
- actions/verify-base, judge, sign wrap them for the workflows.
- cosign.pub is the public half of the COSIGN_PRIVATE_KEY_B64 org secret,
the key rotated on 2026-10-22.
