Actually run cross compile tests #1468

Job	Run time
check	22s
test	2m 38s
audit	23s
rustfmt	6s
clippy	1m 5s
cross-mipsel	2m 28s
cross-mips	2m 18s
legacy_integration-test	19m 23s
cross-armv7	5m 11s
cross-aarch64	6m 7s
legacy_integration-test-with-backcompat	22m 25s
integration-test-five-nodes	17m 38s
integration-test-multi-exit	18m 53s
integration-test-althea-payment	21m 48s
integration-test-debts	21m 48s
integration-test-eth-payments	24m 26s
	2h 46m 59s

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