Note

Medium Risk
Moderate risk because it changes the composite GitHub Action used by CI, which could alter test environment setup and break pipelines if inputs are omitted or image mapping is wrong.

Overview
Updates the run-tests composite GitHub Action to support release/automation use cases by adding optional repository, ref, and client-libs-test-image-tag inputs and performing an explicit actions/checkout.

Makes redis-version optional and adjusts the env setup script to only derive REDIS_VERSION/CLIENT_LIBS_TEST_IMAGE when inputs are provided, allowing callers to override the client-libs test image directly or fall back to the existing version-to-image mapping.

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