import.sh: Fix parsing of distro+arch #569

Job	Run time
sanity	23s
unittests	13s
focal-x64, broken, cont-on-err / build debs	4m 15s
focal-x64, broken / build debs	3m 9s
bookworm-x64, good, verbose=bloom / build debs	8m 13s
jammy-arm64, good, timeout=4 / build debs	4m 17s
jammy-x64, good / build debs	5m 32s
noble-x64, good, verbose=true / build debs	5m 41s
jammy push / deploy	0s
bookworm squash / deploy	0s
	31m 43s

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