ci,make: Add Build_NUMBER, CI ID or PR ID #721

Job	Run time
generate_target_matrix	5s
build_firmware (ath79-generic)	16m 52s
build_firmware (ath79-mikrotik)	16m 53s
build_firmware (ath79-nand)	16m 51s
build_firmware (bcm27xx-bcm2708)	16m 53s
build_firmware (bcm27xx-bcm2709)	16m 53s
build_firmware (bcm27xx-bcm2710)	16m 51s
build_firmware (bcm27xx-bcm2711)	16m 53s
build_firmware (ipq40xx-generic)	16m 52s
build_firmware (ipq40xx-mikrotik)	16m 51s
build_firmware (ipq806x-generic)	16m 52s
build_firmware (lantiq-xrx200)	16m 50s
build_firmware (lantiq-xway)	16m 51s
build_firmware (mediatek-mt7622)	16m 52s
build_firmware (mpc85xx-p1010)	16m 51s
build_firmware (mpc85xx-p1020)	16m 53s
build_firmware (mvebu-cortexa9)	16m 53s
build_firmware (ramips-mt7620)	16m 51s
build_firmware (ramips-mt7621)	16m 49s
build_firmware (ramips-mt76x8)	16m 51s
build_firmware (realtek-rtl838x)	16m 51s
build_firmware (rockchip-armv8)	16m 50s
build_firmware (sunxi-cortexa7)	16m 51s
build_firmware (x86-64)	16m 52s
build_firmware (x86-generic)	16m 51s
build_firmware (x86-geode)	16m 51s
build_firmware (x86-legacy)	16m 55s
create_release	1s
	7h 18m 29s

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