fix: run heredoc with `set -ex` for fast fail

Avoid builds that seem to succeed but that actually failed, e.g. https://eicweb.phy.anl.gov/containers/eic_container/-/jobs/2094238#L2278.

assigned to @wdconinc

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• 7f35ed9a - fix: run heredoc with `set -ex` for fast fail

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• 2ab5ac29 - fix: add one more source setup-env.sh

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• 73eb05fd - fix: more docker-shell fixes

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• a8e6c23e - fix: cp docker-shell before use

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• 1e389a5c - fix: spack cherry-pick (add set -e to entrypoint.sh)

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• 908c2eae - fix: set SPACK_ROOT in final image

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merged