build: functions.bash: Checkout git submodules

build/functions.bash

@@ -34,6 +34,9 @@ function build_git_repo()
 	sed -e "s/VERSION_PLACEHOLDER/$VERSION_CHANGELOG/g" -i ./debian/changelog
 	DATE_CHANGELOG=$(date -R)
 	sed -e "s/DATE_PLACEHOLDER/$DATE_CHANGELOG/g" -i ./debian/changelog
+
+	git submodule init
+	git submodule update
 	dpkg-buildpackage --no-sign
 	cp -a ../*.deb "$TARGET_DIR"/
 }