Add a test for cosign sign

[ianballou]

Problem Statement

We had no test for cosign sign. cosign is a tool used often for signing and attesting that container content is safe. Our OCI registry should be able to integrate with cosign.

Solution

Add a test for cosign sign. Also tests verification.

Installs cosign via the RPM hosted on GitHub. Also disables uploads to the public transparancy log that sigstore maintains.

Related Issues

https://redhat.atlassian.net/browse/SAT-41872

Summary by Sourcery

Tests:

• Add a high-importance Docker API test that pulls an image, pushes it to Satellite’s registry, signs it with cosign, and verifies the signature.

[sourcery-ai]

Reviewer's Guide

Adds an API-level integration test that signs and verifies a container image stored in Satellite’s registry using cosign, including setup of the image, registry credentials, cosign installation, key generation, signing, and verification steps.

File-Level Changes

Change	Details	Files
Add an integration test that validates cosign can sign and verify a container image pushed to Satellite’s registry.	Introduce test_cosign_sign_pushed_image to exercise cosign sign and verify against a Satellite-hosted image. Pull a test image from an external registry, then push it into Satellite’s registry using podman with admin credentials. Install cosign on the target Satellite host if missing and generate a temporary key pair for signing. Use cosign sign with a local key and disabled transparency log upload to sign the pushed image. Use cosign verify with the generated public key and relaxed tlog requirements to ensure the image signature verifies successfully.	tests/foreman/api/test_docker.py

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[ianballou]

trigger: test-robottelo
pytest: tests/foreman/api/test_docker.py::TestPodman::test_cosign_sign_pushed_image

[sourcery-ai]

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

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[Satellite-QE]

PRT Result

Build Number: 16309
Build Status: UNSTABLE
PRT Comment: pytest tests/foreman/api/test_docker.py::TestPodman::test_cosign_sign_pushed_image --external-logging
Test Result : ================== 1 failed, 6 warnings in 960.88s (0:16:00) ===================

[ianballou]

trigger: test-robottelo
pytest: tests/foreman/api/test_docker.py::TestPodman::test_cosign_sign_pushed_image

[Satellite-QE]

PRT Result

Build Number: 16310
Build Status: SUCCESS
PRT Comment: pytest tests/foreman/api/test_docker.py::TestPodman::test_cosign_sign_pushed_image --external-logging
Test Result : ================== 1 passed, 6 warnings in 976.42s (0:16:16) ===================

[aidenfine]

Looks good!