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* fix(ci): sign backends in the format we verify Published backend images carry legacy simplesigning signatures: config application/vnd.dev.cosign.artifact.sig.v1+json, layer application/vnd.dev.cosign.simplesigning.v1+json, attached as referrers with no artifactType. pkg/oci/cosignverify accepts only new-format Sigstore bundles and refuses the legacy format on purpose, so LOCALAI_REQUIRE_BACKEND_INTEGRITY and any gallery verification: block reject our own backends. The cause is one missing flag. backend-signing.md has prescribed `--new-bundle-format` all along; backend_merge.yml never passed it, and the comment beside the cosign pin claims v2.4.1 emits the current bundle format by default, which it does not. The flag arrives in v2.5.0, so the pin moves to v2.6.5 and both sign calls pass it. Verified against a published image today (quay.io/go-skynet/local-ai-backends:latest-gpu-nvidia-cuda-12-llama-cpp): both referrers are simplesigning, so nothing verifies. Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Assisted-by: Claude:claude-opus-5 [Claude Code] * test(ci): require the Sigstore bundle flags The signing test rejected the flags required by the pinned cosign release. Require a bundle flag for each registry while retaining recursion and OCI referrer checks. Assisted-by: Codex:gpt-6 --------- Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Co-authored-by: Ettore Di Giacinto <mudler@localai.io> Co-authored-by: localai-org-maint-bot <306269227+localai-org-maint-bot@users.noreply.github.com>