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windows-2022 runners with VS Enterprise installed pre-set a system-wide VCPKG_ROOT pointing at "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\vcpkg". That value wins over the job-level `env: VCPKG_ROOT:` in PowerShell expansions, so the previous run tried to git-clone into that read-only path and failed with "destination path ... already exists and is not an empty directory". Drop the job-level VCPKG_ROOT and instead resolve the path to "$GITHUB_WORKSPACE\vcpkg" inside the clone step, then write it back via GITHUB_ENV so every later step (including Gradle's findVcpkg / configureNative) picks up our copy. The build step also dumps VCPKG_ROOT / JAVA_HOME / OPENZEN_BUILD_REVISION up front for quick diagnosis if the override ever drifts again. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>