Update to upstream v0.12.1

[JasonPowr]

Summary by Sourcery

Update to upstream v0.12.1: add support for Cosign’s new "bundle" signature format, introduce TUF trusted-root caching via context, preserve original tags when resolving image digests, bump dependencies and CI workflows, and extend APIs and docs with the new signatureFormat field

New Features:

• Support Cosign’s "bundle" signatureFormat in policy authorities with trustedMaterial, signed timestamp, and tlog validation

Enhancements:

• Preserve original image tag when appending digests in the webhook validator
• Unify trustroot reconciliation and TUF resync periods using a shared context helper
• Introduce pkg/tuf caching for trusted root JSON with a resync period

Build:

• Revamp .golangci.yml lint configuration and add a dedicated lint GitHub Actions workflow

CI:

• Upgrade GitHub Actions across all workflows (cache, codecov, codeql, ko, cosign-installer, SBOM, etc.) to latest versions
• Adjust Dependabot to run weekly and group sigstore/minor‐patch updates

Documentation:

• Document the new signatureFormat field in API schemas and config CRDs

Tests:

• Extend validator and authority tests for digest‐without‐tag, ignore unexported fields, and new bundle scenarios
• Add context duration tests for TUF resync helper

[sourcery-ai]

Reviewer's Guide

This PR integrates upstream v0.12.1 by bumping dependencies; introducing TUF-based "bundle" signatureFormat support with context-driven trusted root caching and TSA/CTLog validation; preserving original image tags when appending resolved digests; extending CRD schemas, API types, and docs with signatureFormat; and refreshing CI and lint configurations and workflows.

Sequence diagram for bundle signature format verification with TUF trusted root

sequenceDiagram
    participant Validator
    participant Authority
    participant TUFRepo
    participant TrustedRoot
    participant TSA
    participant CTLog

    Validator->>Authority: Check if SignatureFormat == "bundle"
    alt trustRootRef set
        Validator->>TUFRepo: sigstoreKeysFromContext(trustRootRef)
        TUFRepo->>TrustedRoot: NewTrustedRootFromProtobuf
    else trustRootRef not set
        Validator->>TUFRepo: GetTrustedRoot(ctx)
        TUFRepo->>TrustedRoot: NewTrustedRootFromJSON
    end
    Validator->>TSA: (optional) Validate timestamp (if RFC3161Timestamp)
    Validator->>CTLog: (optional) Validate CTLog (if CTLog)
    Validator-->>Validator: Set CheckOpts with TrustedMaterial

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Class diagram for Authority type with new signatureFormat field

classDiagram
    class Authority {
        +string Name
        +KeyRef Key
        +KeylessRef Keyless
        +TLog CTLog
        +RFC3161Timestamp RFC3161Timestamp
        +string SignatureFormat
        ...
    }

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Class diagram for TUF trusted root context and caching

classDiagram
    class TUFRepo {
        +GetTrustedRoot(ctx)
        -sync.RWMutex mu
        -time.Time timestamp
        -TrustedRoot trustedRoot
    }
    class TrustedRoot {
        ...
    }
    TUFRepo --> TrustedRoot : caches

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File-Level Changes

Change	Details	Files
Implement TUF-based “bundle” signatureFormat support with context-driven trusted root caching	Add NewBundleFormat flag and branch logic in checkOptsFromAuthority Lookup trustRootRef and build TrustedMaterial from protobuf or remote TUF repo Validate matching trustRootRef for TSA and CTLog when using bundle format Extract context helpers (ToContext/FromContextOrDefaults) and implement GetTrustedRoot with caching and resync	pkg/webhook/validator.go pkg/tuf/repo.go pkg/tuf/context.go cmd/webhook/main.go pkg/reconciler/trustroot/controller.go pkg/apis/policy/v1alpha1/clusterimagepolicy_conversion.go pkg/apis/policy/v1beta1/clusterimagepolicy_conversion.go pkg/webhook/clusterimagepolicy/clusterimagepolicy_types.go
Preserve original image tags when appending resolved digests	In resolvePodSpec, detect name.Tag and format image as “name@digest” preserving tag Cover digest-only and tag-preserving scenarios in TestResolvePodSpec	pkg/webhook/validator.go pkg/webhook/validator_test.go
Bump dependencies and refresh CI/lint setup	Upgrade module versions in go.mod/go.sum to align with v0.12.1 Revise .golangci.yml lint config and add dedicated golangci-lint workflow Update GitHub Actions workflows to use latest action versions across all pipeline files	go.mod go.sum .golangci.yml .github/workflows
Extend CRD schemas, API types, and docs with signatureFormat	Add signatureFormat field to ClusterImagePolicy CRD schema and clusterimagepolicy types Populate signatureFormat in conversion between v1alpha1/v1beta1 and webhook types Update API documentation to describe new signatureFormat property	config/300-clusterimagepolicy.yaml docs/api-types/index.md docs/api-types/index-v1alpha1.md pkg/apis/policy/v1alpha1/clusterimagepolicy_types.go pkg/apis/policy/v1beta1/clusterimagepolicy_types.go pkg/apis/policy/v1alpha1/clusterimagepolicy_conversion.go pkg/webhook/clusterimagepolicy/clusterimagepolicy_types.go

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[sourcery-ai]

Hey @JasonPowr - I've reviewed your changes and they look great!

Prompt for AI Agents

Please address the comments from this code review:
## Individual Comments

### Comment 1
<location> `pkg/tuf/repo.go:308` </location>
<code_context>
+)
+
+// GetTrustedRoot returns the trusted root for the TUF repository.
+func GetTrustedRoot(ctx context.Context) (*root.TrustedRoot, error) {
+	resyncPeriodDuration := FromContextOrDefaults(ctx)
+	now := time.Now().UTC()
</code_context>

<issue_to_address>
Potential race condition in GetTrustedRoot due to double-checked locking.

Between releasing the read lock and acquiring the write lock, another goroutine could also refresh the trusted root, causing redundant operations or inconsistent state. Use sync.Once or acquire the write lock for both checking and refreshing to prevent this race.
</issue_to_address>

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