update to always pull latest raspberry pi firmware from github

build-image.sh

@@ -34,6 +34,7 @@ assert_tool blkid
 assert_tool realpath
 assert_tool 7z
 assert_tool dd
+assert_tool jq
 
 ## Check if we are building a supported image
 IMAGE_TYPE=$1
@@ -75,7 +76,7 @@ function dl_dep() {
 mkdir -p deps
 
 if [ "$IMAGE_TYPE" = "raspberrypi" ]; then
-	dl_dep raspberrypi-firmware.tar.gz https://github.com/raspberrypi/firmware/archive/1.20200212.tar.gz
+	dl_dep raspberrypi-firmware.tar.gz "$(curl -s https://api.github.com/repos/raspberrypi/firmware/tags | jq -r '.[0].tarball_url')"
 elif [ "$IMAGE_TYPE" = "orangepipc2" ]; then
 	# TODO: apt.armbian.com removes old versions, so these URLs become
 	# outdated. Find an armbian mirror that keeps old versions so that