Add serializd tuf root E2E test

[JasonPowr]

Summary by Sourcery

Add end-to-end test and supporting utilities for installing a serialized TUF root with the policy-controller-operator

New Features:

• Introduce TufMirrorFS and helper functions to mirror and serialize TUF metadata and targets into a tar.gz filesystem
• Add custom resource templates for PolicyController, TrustRoot, and ClusterImagePolicy to exercise serialized TUF root installation
• Implement an E2E test (serialized_tuf_root_install_test.go) that deploys the operator, renders and applies the serialized TUF root and cluster image policy, and exercises CA injection, webhook enforcement, image signing, provenance, and SBOM flows

Build:

• Add go-tuf/v2 dependency and bump various indirect module versions in go.mod and go.sum

Tests:

• Add Ginkgo/Gomega-based E2E tests to validate serialized TUF root installation and related admission webhooks

[sourcery-ai]

Reviewer's Guide

This PR introduces an end-to-end test for installing a serialized TUF root, extending the test utilities to mirror and package a TUF repository, updating module dependencies, and adding CR templates and a test suite for serialized root installation.

Class diagram for new E2E serialized TUF root test utilities

classDiagram
    class RhtasUtils {
        +MirrorTUFRepo()
        +PackageTUFRepo()
        ...
    }
    class SerializedTUFRootInstallTest {
        +TestInstallSerializedTUFRoot()
        ...
    }
    RhtasUtils <.. SerializedTUFRootInstallTest : uses

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File-Level Changes

Change	Details	Files
Extend e2e utilities to mirror, package, and serialize a TUF repository	Add TufMirrorFS, tarDir, writeVersionedMetadataFile functions Use go-tuf updater to fetch targets and metadata Gzip and tar the mirrored repository directory	test/e2e/utils/rhtas.go
Add serialized TUF root end-to-end test and associated CR templates	Introduce serialized_tuf_root_install_test.go with test cases for TrustRoot and ClusterImagePolicy Create policy_controller, trust_root, and cluster_image_policy YAML templates Render and apply manifests in tests to verify resource injection	test/e2e/serialized_tuf_root_install_test.go test/e2e/custom_resources/serialized_tuf_root/cluster_image_policy.yaml.tpl test/e2e/custom_resources/serialized_tuf_root/policy_controller.yaml.tpl test/e2e/custom_resources/serialized_tuf_root/trust_root.yaml.tpl
Bump go-tuf dependency and update indirect module versions	Add github.com/theupdateframework/go-tuf/v2 requirement Update several golang.org/x and google.golang.org module versions Regenerate go.sum accordingly	go.mod go.sum

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[sourcery-ai]

Hey @JasonPowr - I've reviewed your changes - here's some feedback:

• In tarDir you defer gw.Close() and tw.Close() but never check their returned errors—capture and return those Close() errors to avoid hiding I/O failures when writing the tarball.
• os.MkdirTemp is invoked with "." which creates temp dirs in the repo root—pass an empty string ("" as the first arg) to use the system temp directory and avoid polluting your working tree.
• TufMirrorFS buffers the entire gzipped tar in memory before returning—consider streaming to a file or using an io.Pipe to reduce peak memory usage for large repositories.

Prompt for AI Agents

Please address the comments from this code review:
## Overall Comments
- In tarDir you defer gw.Close() and tw.Close() but never check their returned errors—capture and return those Close() errors to avoid hiding I/O failures when writing the tarball.
- os.MkdirTemp is invoked with "." which creates temp dirs in the repo root—pass an empty string ("" as the first arg) to use the system temp directory and avoid polluting your working tree.
- TufMirrorFS buffers the entire gzipped tar in memory before returning—consider streaming to a file or using an io.Pipe to reduce peak memory usage for large repositories.

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