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Add a 'Check if image already exists in GHCR' step to tier1 and tier2 base image jobs. After GHCR login, inspect the branch-tagged manifest and set exists=true if found. The metadata extract, build-push, and attestation steps are all gated on exists != 'true', so subsequent pushes that haven't changed Dockerfiles skip the 30-60 min conan/apt/ node/pip/android builds entirely. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>