Add artifact_attestation(http, filename) and wire verifier support for
artifact bundle checks. Add docker_github_builder_bundle helper rule.
Handle runtime unknown http.checksum after eval so metadata resolve is
requested when checksum is missing.
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
- Make sure tag is added to image reference as
containerd reference parser refuses to parse otherwise.
- When attestation is asked from non-index, return
nil instead of error. This is for consistency as likely
to fail in BuildKit before that is fixed separately.
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>