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Build SilverMetal Linux ISO (reproducibility-gated) / build-and-verify (push) Failing after 1m18s
build.sh ran fine locally but failed in Gitea Actions on the first reproducibility-gated run (#4250) with: bash: line 3: /work/linux/build/config/silvermetal-base.conf: No such file or directory Root cause: classic Docker-out-of-Docker confusion. build.sh runs inside the act_runner job container, which talks to the host's docker daemon via the mounted /var/run/docker.sock. The "-v ${REPO_ROOT}:/work" flag was being interpreted by the host daemon against the host filesystem, where /workspace/SilverLABS/SilverMetal does not exist; docker silently auto-created an empty dir there and mounted that as /work, so the config source target was missing. Fix: detect GITHUB_ACTIONS and use --volumes-from "$(hostname)" in CI to inherit the parent job container's /workspace mount intact. Locally we keep a bind mount, but use the same path inside and outside (${REPO_ROOT}:${REPO_ROOT}) so the inner heredoc is identical in both modes. Inner script now references "${REPO_ROOT}/..." and "${BUILD_DIR}/..." instead of the synthetic /work and /out paths. No reproducibility implications — bind topology doesn't affect bytes inside the ISO. Verified locally: bash -n passes; structural change only, behaviour preserved for the non-CI path. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>