7.4 to unstable

[Peter-Sh]

Note

Medium Risk
Changes CI build/test matrix generation and Docker image validation/labeling behavior, which can affect which platforms are built and how images are tagged/tested. Also adjusts stackbrew tag emission rules (notably latest) based on remote GA majors, which could impact downstream consumers if incorrect.

Overview
Updates the GitHub Actions pipeline to compute the distro/platform build matrix dynamically via a new release-automation generate-build-matrix command, replacing the hardcoded matrix in build-n-test.yml.

Enhances build/test and labeling to be Redis-version aware: the local build action now extracts the Redis version from the source tarball, uses it to decide whether module-related checks/run-entrypoint tests should execute, and passes a new modules_enabled flag into create-image-labels so module revision labels (and module repo checkouts/version discovery) are skipped when modules aren’t expected.

Refines stackbrew tag generation so global latest/bare-distro tags are only emitted for the highest remote GA major version, adding git logic to discover that major and updating generator APIs/tests accordingly.

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