Adding support to build provenance and sbom for build images

[visheshtanksale]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Add support for SLSA provenance and SBOM generation as part of the image build process

Which issue(s) this PR is related to:

Fixes #1105
#1105

Special notes for your reviewer:

Verified that the provenance and SBOM is built works locally. Not sure how to test this with kpromo. Looking at the documentation it looks like this should work with kpromo.

Sample SLSA Provenance

{
  "buildDefinition": {
    "buildType": "https://cloudbuild.googleapis.com/CloudBuildYaml@v1",
    "externalParameters": {
      "source": {
        "uri": "git+https://github.com/visheshtanksale/k8s-dra-driver-gpu",
        "ref": "refs/heads/sbom-provenance-support",
        "digest": {
          "gitCommit": "160bbb87b5ee827e7152b4bc4d08f40b8bd630f6"
        }
      },
      "chart": {
        "name": "dra-driver-nvidia-gpu",
        "version": "0.0.0-test",
        "ref": "example.com/dra-driver-nvidia/charts/dra-driver-nvidia-gpu@sha256:ae9c140499d32f04de2c9023dca4d3c6eb6453372178db0fe90680cd42b24b0d",
        "digest": {
          "sha256": "ae9c140499d32f04de2c9023dca4d3c6eb6453372178db0fe90680cd42b24b0d"
        }
      }
    },
    "internalParameters": {},
    "resolvedDependencies": [
      {
        "uri": "git+https://github.com/visheshtanksale/k8s-dra-driver-gpu@refs/heads/sbom-provenance-support",
        "digest": {
          "gitCommit": "160bbb87b5ee827e7152b4bc4d08f40b8bd630f6"
        }
      }
    ]
  },
  "runDetails": {
    "builder": {
      "id": "https://cloudbuild.googleapis.com/projects/test-project"
    },
    "metadata": {
      "invocationId": "https://cloudbuild.googleapis.com/v1/projects/test-project/builds/test-build",
      "finishedOn": "2026-06-12T20:22:13Z"
    }
  }
}

Sample SBOM SPDX

{
  "spdxVersion": "SPDX-2.3",
  "dataLicense": "CC0-1.0",
  "SPDXID": "SPDXRef-DOCUMENT",
  "name": "dra-driver-nvidia-gpu-0.0.0-test Helm chart SBOM",
  "documentNamespace": "https://sigs.k8s.io/dra-driver-nvidia-gpu/spdx/dra-driver-nvidia-gpu/0.0.0-test/ae9c140499d32f04de2c9023dca4d3c6eb6453372178db0fe90680cd42b24b0d",
  "documentDescribes": [
    "SPDXRef-Package-helm-chart"
  ],
  "creationInfo": {
    "created": "2026-06-12T20:22:13Z",
    "creators": [
      "Organization: Kubernetes Authors",
      "Tool: hack/generate-helm-chart-attestation-predicates.sh"
    ]
  },
  "packages": [
    {
      "name": "dra-driver-nvidia-gpu",
      "SPDXID": "SPDXRef-Package-helm-chart",
      "versionInfo": "0.0.0-test",
      "downloadLocation": "oci://example.com/dra-driver-nvidia/charts/dra-driver-nvidia-gpu@sha256:ae9c140499d32f04de2c9023dca4d3c6eb6453372178db0fe90680cd42b24b0d",
      "filesAnalyzed": false,
      "checksums": [
        {
          "algorithm": "SHA256",
          "checksumValue": "ae9c140499d32f04de2c9023dca4d3c6eb6453372178db0fe90680cd42b24b0d"
        }
      ],
      "licenseConcluded": "Apache-2.0",
      "licenseDeclared": "Apache-2.0",
      "copyrightText": "The Kubernetes Authors"
    }
  ]
}

Does this PR introduce a user-facing change?

None

Additional documentation (design docs, usage docs, etc.):

Checklist

• make check test passes locally
• make check-generate passes if api/ changed (CRDs, deepcopy, informers, listers, clientset)
• make check-modules passes if go.mod / go.sum changed
• Tests added or updated for the change
• Helm chart (deployments/helm) updated if flags, RBAC, or defaults changed

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: visheshtanksale
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[shivamerla]

@visheshtanksale can we include signed cosign attestations for helm chart artifact too.

[shivamerla]

Can you add sample output of these attestations for existing builds in the PR.

[visheshtanksale]

I added the sample slsa provenance and sbom in the PR description