Prototype: cache CMake FetchContent populated dir with actions/cache#1685

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bghgary:prototype-fetchcontent-cache

Commits on May 4, 2026

CI: cache FetchContent populated dir with actions/cache

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Commits on May 5, 2026

CI: differentiate FetchContent cache keys per workflow + platform

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ci: trigger warm-cache run (empty commit, cache should be hot)

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CI: exclude *-build dirs from FetchContent cache

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ci: trigger warm-cache run (cache should be hot from previous run)

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CI: bump FetchContent cache key prefix to v2 to invalidate stale caches

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ci: warm-cache run with v2 keys

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