CI: Zephyr: Get latest version of the zephyr sdk

To avoid having any misalignment between Zephyr and the SDK during
CI tests, consider getting the latest version of the Zephyr SDK
automatically instead of hardcoding it.
This approach should ensure that the latest version of sdk is always used.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>

.github/actions/build_ci/entrypoint.sh

@@ -3,12 +3,8 @@
 readonly TARGET="$1"
 
 ZEPHYR_TOOLCHAIN_VARIANT=zephyr
-ZEPHYR_SDK_INSTALL_DIR=/opt/zephyr-sdk
-ZEPHYR_SDK_VERSION=0.16.1
-ZEPHYR_SDK_DOWNLOAD_FOLDER=https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v$ZEPHYR_SDK_VERSION
-ZEPHYR_SDK_SETUP_DIR=zephyr-sdk-$ZEPHYR_SDK_VERSION
-ZEPHYR_SDK_SETUP_TAR=${ZEPHYR_SDK_SETUP_DIR}_linux-x86_64.tar.xz
-ZEPHYR_SDK_DOWNLOAD_URL=$ZEPHYR_SDK_DOWNLOAD_FOLDER/$ZEPHYR_SDK_SETUP_TAR
+ZEPHYR_SDK_API_FOLDER=https://github.com/gitapi/repos/zephyrproject-rtos/sdk-ng/releases/latest
+ZEPHYR_SDK_SETUP_TAR=zephyr-sdk-.*linux-x86_64.tar.xz
 
 FREERTOS_ZIP_URL=https://cfhcable.dl.sourceforge.net/project/freertos/FreeRTOS/V10.0.1/FreeRTOSv10.0.1.zip
 
@@ -17,7 +13,7 @@ pre_build(){
 	echo 'Etc/UTC' > /etc/timezone &&
 	ln -s /usr/share/zoneinfo/Etc/UTC /etc/localtime &&
 	apt update &&
-	apt-get install -y make || exit 1
+	apt-get install -y make curl || exit 1
 	sudo pip3 install cmake || exit 1
 }
 
@@ -57,6 +53,10 @@ build_freertos(){
 }
 
 build_zephyr(){
+	ZEPHYR_SDK_DOWNLOAD_URL=`curl -s ${ZEPHYR_SDK_API_FOLDER} | \
+		grep -e "browser_download_url.*${ZEPHYR_SDK_SETUP_TAR}"| cut -d : -f 2,3 | tr -d \"`
+	ZEPHYR_SDK_TAR=`basename  $ZEPHYR_SDK_DOWNLOAD_URL`
+	ZEPHYR_SDK_SETUP_DIR=`echo $ZEPHYR_SDK_TAR | cut -d_ -f1`
 	echo  " Build for Zephyr OS "
 	sudo apt-get install -y git cmake ninja-build gperf || exit 1
 	sudo apt-get install -y ccache dfu-util device-tree-compiler wget pv || exit 1
@@ -71,9 +71,9 @@ build_zephyr(){
 	source ~/.bashrc
 
 	wget $ZEPHYR_SDK_DOWNLOAD_URL --dot-style=giga || exit 1
-	echo "Extracting $ZEPHYR_SDK_SETUP_TAR"
-	pv $ZEPHYR_SDK_SETUP_TAR -i 3 -ptebr -f | tar xJ || exit 1
-	rm -rf $ZEPHYR_SDK_INSTALL_DIR || exit 1
+	echo "Extracting $ZEPHYR_SDK_TAR"
+	pv $ZEPHYR_SDK_TAR -i 3 -ptebr -f | tar xJ || exit 1
+	rm -rf $ZEPHYR_SDK_TAR || exit 1
 	yes | ./$ZEPHYR_SDK_SETUP_DIR/setup.sh || exit 1
 	west init ./zephyrproject || exit 1
 	cd ./zephyrproject || exit 1