build: add error and boldness for missing submodule message
Minor but caught me for a minute, boldness helps it to pop out.
@@ -90,7 +90,7 @@ make_and_makeinstall() {
rsync -rlv "${srcdir}"/ostree-releng-scripts/ /usr/app/ostree-releng-scripts/
if ! test -f mantle/README.md; then
- echo "Run: git submodule update --init" 1>&2
+ echo -e "\033[1merror: submodules not initialized. Run: git submodule update --init\033[0m" 1>&2
exit 1
fi
