Configure process to complain about unset variable #632

Job	Run time
lint	10s
lint	35s
lint	35s
print-pack-getting-started-output (aarch64-unknown-linux-musl)	3m 25s
print-pack-getting-started-output (aarch64-unknown-linux-musl)	6m 12s
print-pack-getting-started-output (aarch64-unknown-linux-musl)	4m 24s
print-pack-getting-started-output (x86_64-unknown-linux-musl)	2m 58s
print-pack-getting-started-output (x86_64-unknown-linux-musl)	4m 13s
print-pack-getting-started-output (x86_64-unknown-linux-musl)	4m 13s
print-style-guide	22s
print-style-guide	47s
print-style-guide	47s
integration-test	2m 15s
integration-test	3m 36s
integration-test	3m 36s
unit-test	19s
unit-test	1m 6s
unit-test	1m 6s
	40m 39s

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