buildlab: fix triggers parsing

buildlab.in

@@ -166,7 +166,7 @@ build_package() {
 	done
 
 	for i in $triggers; do
-		src=$(echo $i | cut -d: -f1)
+		src=${i%=*}
 		is_local $src || continue
 
 		msg "${srcdir}/${src} -> ${path}/home/abuild/src/${src} ..."