- check-dir.sh: with set -u, invoking without a <dir> argument failed with an
opaque "parameter not set" error. Add an explicit argc check that prints a
usage message and exits 2 (distinct from the assertion failure code 1).
- e2e-cache.yml: the sbt-save and sbt-restore jobs run on an ubuntu-22.04
matrix entry, but their coursier-cache steps were guarded by
'if: matrix.os == "ubuntu-latest"', so those checks never executed on
Ubuntu. Align the conditionals with the matrix (ubuntu-22.04), matching the
newer sbt1/sbt2 jobs.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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