fix: update ECR workflow runner label

[lucasSlv]

Context

This change updates the runner label used by the base ECR workflow so the job executes on the intended GitHub Actions runner.

What was changed

• Updated .github/workflows/base_build_push_ecr.yml
• Changed the setup job runner from ubuntu-latest to ubuntu-larger

Technical rationale

The workflow needs to target the larger runner label instead of the default Ubuntu image. This aligns the ECR publishing job with the expected execution environment and available runner capacity.

Impacts and considerations

• Affects only the CI-ECR-BASE workflow execution environment
• No application code or runtime behavior is changed
• Workflow execution now depends on availability of the ubuntu-larger runner label

Test plan

• Validate that the workflow is accepted by GitHub Actions
• Run the ECR base workflow in a test scenario and confirm the job starts on ubuntu-larger
• Confirm the image load and push steps still complete successfully