reproducer tests: grab output/error, and use the correct python #5293

Job	Run time
check-package / init-store	8s
check-schema / schema	12s
precommit-run / pre-commit	32s
check-package / pkg-build (ubuntu-latest)	27s
check-package / pkg-check (ubuntu-latest, 3.10)	2m 44s
check-package / pkg-check (ubuntu-latest, 3.11)	2m 42s
check-package / pkg-check (macOS-latest, 3.10)	1m 1s
check-package / pkg-check (macOS-latest, 3.11)	54s
check-package / pkg-check (windows-latest, 3.10)	3m 14s
check-package / pkg-check (windows-latest, 3.11)	2m 52s
check-package / pkg-guardian	1s
	14m 47s

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