Add script to auto-generate CODEOWNERS

This script will read `BOARD_MAINTAINER` from all board configs and generate `CODEOWNERS`

.github/generate_CODEOWNERS.sh

@@ -0,0 +1,96 @@
+#!/bin/bash
+
+SRC="$(realpath "${BASH_SOURCE%/*}/../")"
+
+# Dummy function for successful source
+function display_alert() {
+	:
+}
+function enable_extension() {
+	:
+}
+
+# $1: board config
+function generate_for_board() {
+	local board_config="$1"
+	(
+		source "${SRC}/config/boards/${board_config}"
+		LINUXFAMILY="${BOARDFAMILY}"
+
+		[[ -n "${BOARD_MAINTAINER}" ]] || return
+		maintainers="$(echo "${BOARD_MAINTAINER}" | xargs -n1 | sed -E 's|^.+$|@\0|' | tr '\n' ' ')"
+
+		while read -r BRANCH; do
+			(
+				source "${SRC}/config/sources/families/${LINUXFAMILY}.conf"
+				source "${SRC}/config/sources/common.conf"
+				source "${SRC}/config/sources/${ARCH}.conf"
+
+				[[ -z $LINUXCONFIG ]] && LINUXCONFIG="linux-${LINUXFAMILY}-${BRANCH}"
+				[[ -z $KERNELPATCHDIR ]] && KERNELPATCHDIR="$LINUXFAMILY-$BRANCH"
+
+				cat <<-EOF
+					config/boards/${board_config}			${maintainers}
+					config/kernel/${LINUXCONFIG%-*}-*.config	${maintainers}
+					sources/families/${LINUXFAMILY}.conf		${maintainers}
+					patch/kernel/${KERNELPATCHDIR%-*}-*/		${maintainers}
+				EOF
+
+				local patch_archive="$(readlink "patch/kernel/${KERNELPATCHDIR}" || true)"
+				if [[ -n "${patch_archive}" ]]; then
+					patch_archive="${patch_archive%/}"
+					echo "patch/kernel/${patch_archive%-*}-*/	${maintainers}"
+				fi
+			)
+		done < <(echo "${KERNEL_TARGET}" | tr ',' '\n')
+	)
+}
+
+function generate_for_all_board() {
+	local board_config
+	while read -r board_config; do
+		local type="${board_config##*.}"
+		[[ "conf wip csc eos tvb" == *"${type}"* ]] || continue
+
+		generate_for_board "${board_config}"
+	done < <(ls "${SRC}/config/boards/")
+}
+
+function merge() {
+	local line
+	declare -A codeowners
+	while read -r line; do
+		local file="$(echo "${line}" | tr -s '[:space:]' ' ' | cut -d' ' -f1)"
+		local maintainers="$(echo "${line}" | tr -s '[:space:]' ' ' | cut -d' ' -f2-)"
+		codeowners["$file"]+=" ${maintainers}"
+	done
+
+	local file
+	while read -r file; do
+		declare -a maintainers
+		readarray -t maintainers < <(echo "${codeowners["$file"]}" | xargs -n1 | sort -u)
+		echo "${file}		${maintainers[*]}"
+	done < <(printf "%s\n" "${!codeowners[@]}" | sort)
+}
+
+cat <<-EOF >"${SRC}/.github/CODEOWNERS"
+	# PLEASE DON'T EDIT THIS FILE
+	# Auto generated by ".github/generate_CODEOWNERS.sh"
+
+	# Default code owner
+	*			@igorpecovnik
+
+	# the last matching pattern takes the most
+
+	*.md			@EvilOlaf @littlecxm @TheLinuxBug @TRSx80 @igorpecovnik
+	
+	.github/		@igorpecovnik @rpardini @hzyitc
+
+	lib/			@armbian/build-scripts
+	packages/		@armbian/build-scripts
+	packages/bsp/jethub/	@armbian/build-scripts @adeepn
+	tools/			@iav @neheb @hzyitc @mhoffrog
+
+	# The following contents are generated by board configs
+	$(generate_for_all_board | merge)
+EOF