Jenkins: add Jenkins pipeline for automatic builds #13

Job	Run time
build (stm32f7, chibios, 6)	12m 11s
build (stm32f7, chibios, 10)	12m 17s
build (stm32h7, chibios, 6)	9m 42s
build (stm32h7, chibios, 10)	10m 3s
build (fmuv2-plane, chibios, 10)	4m 51s
build (periph-build, chibios, 10)	16m 4s
build (iofirmware, chibios, 6)	1m 26s
build (iofirmware, chibios, 10)	1m 25s
build (CubeOrange-bootloader, chibios, 6)	1m 8s
build (CubeOrange-bootloader, chibios, 10)	1m 32s
build (fmuv3-bootloader, chibios, 10)	1m 2s
build (revo-bootloader, chibios, 6)	1m 32s
build (revo-bootloader, chibios, 10)	1m 2s
build (stm32h7-debug, chibios, 6)	5m 53s
build (stm32h7-debug, chibios, 10)	5m 53s
build (fmuv3, chibios, 6)	10m 55s
build (fmuv3, chibios, 10)	10m 48s
build (revo-mini, chibios, 10)	9m 20s
build (MatekF405-Wing, chibios, 10)	9m 30s
build (CubeOrange-ODID, chibios, 10)	6m 49s
build (configure-all, chibios, 6)	7m 10s
build (configure-all, chibios, 10)	7m 32s
build (build-options-defaults-test, chibios, 6)	17m 29s
build (build-options-defaults-test, chibios, 10)	17m 52s
build (signing, chibios, 10)	9m 36s
build (stm32h7, chibios-py2)	9m 41s
	3h 22m 43s

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