Fix/use tempfiles for isolation #3074

Job	Run time
check-version	7s
shfmt	36s
shellcheck	6s
lint (3.12)	10s
changelog	7s
lint (3.11)	14s
lint (3.10)	11s
lint (3.9)	14s
test_ingest_unit_unstructured	0s
test_install_cli	0s
test_ingest_unit	0s
test_ingest_help	0s
	1m 45s

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