fix: GitHub Actions: add site.conf support #349

Job	Run time
prepare	1m 44s
build (beaglebone, false, .)	7s
build (beaglebone-ai64, false, .)	7s
build (beagleplay, false, .)	6s
build (raspberrypi, false, .)	6s
build (raspberrypi-cm, false, .)	6s
build (raspberrypi0, false, .)	7s
build (raspberrypi0-wifi, false, .)	6s
build (raspberrypi2, false, .)	7s
build (raspberrypi0-2w, false, .)	6s
build (raspberrypi0-2w-64, false, .)	6s
build (raspberrypi3, false, .)	6s
build (raspberrypi3-64, false, .)	6s
build (raspberrypi-cm3, false, .)	6s
build (raspberrypi4, false, .)	7s
build (raspberrypi4-64, false, .)	6s
build (raspberrypi5, false, .)	8s
build (qemuarm64, false, .)	6s
build (qemux86-64, false, .)	7s
build (vexpress-qemu, false, .)	6s
build (vexpress-qemu-flash, false, .)	7s
build (x86-virtual, false, .)	7s
build (beaglebone-uboot, false, .)	6s
build (olimex-imx8mp-evb, false, .)	7s
build (raspberrypi4-64-app-updates, demos, true)	6s
build (imx93-var-som, true)	7s
build (qemuarm64-client-only, demos, false)	7s
	4m 33s

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