The frontend job succeeded after the runner HOME fix, but backend failed at
a different point: actions/checkout is a JavaScript action and needs a Node
runtime inside the job container to run it at all (exec: "node": executable
file not found in $PATH), and hseeberger/scala-sbt has no Node installed.
Same lesson HOP's own CI setup already documented ("JavaScript actions need
Node in the job image") -- mirroring their fix: install git+nodejs via apt
before the checkout step.
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