Merge pull request #357 from ElementsProject/ci/buf-check-separation #907

Job	Run time
unit-tests	1m 29s
integration-tests (bitcoin-cln)	14m 49s
integration-tests (bitcoin-lnd)	16m 6s
integration-tests (liquid-cln)	14m 7s
integration-tests (liquid-lnd)	14m 22s
integration-tests (misc-integration)	13m 35s
integration-tests (lwk-cln)	12m 58s
integration-tests (lwk-lnd)	13m 24s
	1h 40m 50s

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