Add an extra step to the `Getting started` #303

Job	Run time
build (debug, zswatch_nrf5340_cpuapp@1)	7m 50s
build (debug, zswatch_nrf5340_cpuapp@3)	6m 44s
build (debug, native_posix)	6m 3s
build (debug, nrf5340dk_nrf5340_cpuapp)	6m 8s
build (release, zswatch_nrf5340_cpuapp@1)	4m 17s
build (release, zswatch_nrf5340_cpuapp@3)	7m 47s
build (release, native_posix)	4m 9s
build (release, nrf5340dk_nrf5340_cpuapp)	5m 41s
	48m 39s

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