Claude/actions runner package install 6bcwdl - #1
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The official Node.js binaries link against libatomic.so.1 starting with Node.js 25 (confirmed with `readelf -d bin/node`: the NEEDED entry is absent in v24.x and present in v25.x and v26.x, on both linux-x64 and linux-arm64). The dotnet/runtime-deps base image does not ship that library, so a workflow that provisions Node with actions/setup-node fails at exec time with: node: error while loading shared libraries: libatomic.so.1: cannot open shared object file: No such file or directory Add libatomic1 to the existing apt transaction in the runtime stage. It comes from Ubuntu main (source package gcc-14), so it adds no new repository or trust anchor, ships no executables, and costs ~50 kB installed. Reusing the existing RUN keeps the layer count unchanged and keeps the package lists cleaned up in the same step. Also add a cheap regression test to the docker job so the library cannot silently disappear from the image again. Fixes actions#4591
Non-containerized self-hosted runners hit the same Node.js 25+ failure as the container image: actions/setup-node installs Node into the tool cache, and it cannot start without libatomic.so.1. Install the library from each distribution's own package manager (libatomic1 on Debian/SUSE based, libatomic on Fedora based). This is done best-effort rather than as a hard requirement: the runner itself does not need libatomic today, since the bundled externals/node20 and externals/node24 do not link against it, so a distribution that does not package it must still configure successfully. On failure the script prints an actionable warning naming the package and the error it prevents. For the same reason config.sh is left alone -- gating runner configuration on a library only future Node.js versions need would be a regression. Document the dependency and the reasoning in docs/start/envlinux.md.
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