CI: install pip packages before exporting zephyr cmake package

Since Zephyr 4.0, the command west packages pip --install must be run
before west zephyr-export.

Without this order, an error can occur when running west zephyr-export.

ModuleNotFoundError: No module named 'jsonschema'

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

.github/actions/build_ci/entrypoint.sh

@@ -74,8 +74,8 @@ build_zephyr(){
 	west init --mr $ZEPHYR_VERSION ./zephyrproject || exit 1
 	cd ./zephyrproject || exit 1
 	west update --narrow || exit 1
-	west zephyr-export || exit 1
 	west packages pip --install || exit 1
+	west zephyr-export || exit 1
 
 	echo  "Zephyr sdk install"
 	cd ./zephyr &&