github: add PR backport action #313

Job	Run time
generate_target_matrix	3s
build_firmware (ath79-generic)	1m 36s
build_firmware (ath79-mikrotik)	1m 34s
build_firmware (ath79-nand)	1m 32s
build_firmware (bcm27xx-bcm2708)	1m 24s
build_firmware (bcm27xx-bcm2709)	1m 22s
build_firmware (bcm27xx-bcm2710)	1m 35s
build_firmware (bcm27xx-bcm2711)	1m 23s
build_firmware (ipq40xx-generic)	1m 48s
build_firmware (ipq40xx-mikrotik)	1m 34s
build_firmware (ipq806x-generic)	1m 34s
build_firmware (lantiq-xrx200)	1s
build_firmware (lantiq-xway)	1s
build_firmware (mediatek-mt7622)	1s
build_firmware (mpc85xx-p1010)	1s
build_firmware (mpc85xx-p1020)	1s
build_firmware (mvebu-cortexa9)	1s
build_firmware (ramips-mt7620)	1s
build_firmware (ramips-mt7621)	1s
build_firmware (ramips-mt76x8)	1s
build_firmware (rockchip-armv8)	1s
build_firmware (sunxi-cortexa7)	1s
build_firmware (x86-64)	1s
build_firmware (x86-generic)	1s
build_firmware (x86-geode)	1s
build_firmware (x86-legacy)	1s
create_release	1s
	15m 41s

Provide feedback