[DX-3582] run regression tests with public images

[Tofel]

Tests:

• CRE system tests pass in CI
• CRE regression tests work with public image [image was resolved correctly, but tests failed, because of lack of compatibility between the image and orchestration code]
• CRE system tests work with private image with explicit tag and empty chainlink version
• CRE system tests work with private image with explicit chainlink version and tag

[github-actions]

✅ No conflicts with other open PRs targeting develop

[trunk-io]

     

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[Copilot]

Pull request overview

Risk Rating: MEDIUM

Updates the CRE regression system test workflows to support running against public Chainlink Docker images (via a full image reference) while keeping existing private ECR-based behavior working for CI.

Changes:

• Renamed the reusable workflow input from ecr_name to chainlink_image_repo in the integration workflow call site.
• Expanded cre-regression-system-tests.yaml inputs to support chainlink_full_image and to make chainlink_image_tag / chainlink_version optional with sensible defaults.
• Added public ECR authentication and aligned regression tests with the existing “resolve Chainlink image” mechanism used by CRE system tests.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/integration-tests.yml	Updates the regression workflow call to pass chainlink_image_repo instead of ecr_name.
.github/workflows/cre-regression-system-tests.yaml	Adds public-image support via chainlink_full_image, defaults chainlink_version to github.sha, authenticates to public ECR, and resolves the Chainlink image via the shared resolver script.