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The backend matrix path filter only matched files under a backend's own directory, so a change to shared build infrastructure rebuilt nothing at all: an empty matrix, every job green, and the change reaching no image. PR #10946 fixed scripts/build/package-gpu-libs.sh shipping a partial 4-of-8 cuDNN library set, which mixed versions with the venv's pip cuDNN and produced CUDNN_STATUS_SUBLIBRARY_VERSION_MISMATCH at inference time. It merged 1h48m after the weekly full-matrix cron had already run, so no backend image ever received the fix and nothing signalled that it had been un-shipped. Add a SHARED_BUILD_INPUTS table mapping each shared path to the narrowest set of matrix entries it can honestly invalidate, plus a generic rule for backend/Dockerfile.<x> (which each entry already names). A full matrix is 417 Linux + 56 Darwin builds, so package-gpu-libs.sh now rebuilds the 176 Python entries rather than everything. Unclassified files under scripts/build/ fall back to a full rebuild deliberately: over-building is recoverable, silently shipping nothing is not. Extract the filtering logic to scripts/lib/backend-filter.mjs so it can be unit-tested without bun, js-yaml or a GitHub API round-trip, and run those tests from the existing lint workflow via `make test-ci-scripts`. Assisted-by: Claude Code:claude-opus-4-8[1m] [Read] [Edit] [Bash] Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Co-authored-by: Ettore Di Giacinto <mudler@localai.io>