remove direct python dependency from build scripts #23

Job	Run time
build-aem-firmware / build-firmware	2m 47s
build-dada-firmware / build-firmware	5m 4s
build-bba1-firmware / build-firmware	4m 58s
build-bba2-firmware / build-firmware	5m 1s
build-mk2-firmware / build-firmware	2m 52s
build-str-firmware / build-firmware	2m 48s
build-v1-firmware / build-firmware	4m 58s
build-v2-firmware / build-firmware	4m 53s
	33m 21s

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